diff --git a/src/ext/lib/ObjectCopy.ts b/src/ext/lib/ObjectCopy.ts
index 2bceccf..9302e65 100644
--- a/src/ext/lib/ObjectCopy.ts
+++ b/src/ext/lib/ObjectCopy.ts
@@ -4,7 +4,7 @@ class ObjectCopy {
   static addNew(current, newValues){
     
     // clone target
-    var out = JSON.parse(JSON.stringify(newValues));
+    let out = JSON.parse(JSON.stringify(newValues));
 
     if(! current) {
       if(Debug.debug) {
@@ -14,7 +14,7 @@ class ObjectCopy {
       return out;
     }
 
-    for(var k in out) {
+    for(let k in out) {
       // if current key exist, replace it with existing value. Take no action otherwise.
       if(current[k]) {
 
@@ -37,7 +37,7 @@ class ObjectCopy {
 
     // add the values that would otherwise be deleted back to our object. (We need that so user-defined
     // sites don't get forgotten)
-    for(var k in current) {
+    for(let k in current) {
       if (! out[k]) {
         out[k] = current[k];
       }
@@ -47,7 +47,7 @@ class ObjectCopy {
   }
 
   static overwrite(current, newValues){
-    for(var k in newValues) {
+    for(let k in newValues) {
       // if current key exist, replace it with existing value. Take no action otherwise.
       if (current[k] !== undefined) {
         // Types and constructors of objects must match. If they don't, we always use the new value.
diff --git a/src/ext/lib/ar-detect/ArDetector.ts b/src/ext/lib/ar-detect/ArDetector.ts
index 47d1671..a68132f 100644
--- a/src/ext/lib/ar-detect/ArDetector.ts
+++ b/src/ext/lib/ar-detect/ArDetector.ts
@@ -161,16 +161,16 @@ class ArDetector {
     // [2] determine places we'll use to sample our main frame
     //
 
-    var ncol = this.settings.active.arDetect.sampling.staticCols;
-    var nrow = this.settings.active.arDetect.sampling.staticRows;
+    let ncol = this.settings.active.arDetect.sampling.staticCols;
+    let nrow = this.settings.active.arDetect.sampling.staticRows;
     
-    var colSpacing = this.canvas.width / ncol;
-    var rowSpacing = (this.canvas.height << 2) / nrow;
+    let colSpacing = this.canvas.width / ncol;
+    let rowSpacing = (this.canvas.height << 2) / nrow;
     
     this.sampleLines = [];
     this.sampleCols = [];
 
-    for(var i = 0; i < ncol; i++){
+    for(let i = 0; i < ncol; i++){
       if(i < ncol - 1)
         this.sampleCols.push(Math.round(colSpacing * i));
       else{
@@ -178,7 +178,7 @@ class ArDetector {
       }
     }
 
-    for(var i = 0; i < nrow; i++){
+    for(let i = 0; i < nrow; i++){
       if(i < ncol - 5)
         this.sampleLines.push(Math.round(rowSpacing * i));
       else{
@@ -381,7 +381,7 @@ class ArDetector {
       clearTimeout(this.setupTimer);
     }
     
-    var ths = this;
+    let ths = this;
     this.setupTimer = setTimeout(function(){
         ths.setupTimer = null;
         try{
@@ -419,7 +419,7 @@ class ArDetector {
   }
 
   getTimeout(baseTimeout, startTime){
-    var execTime = (performance.now() - startTime);
+    let execTime = (performance.now() - startTime);
     
     return baseTimeout;
   }
@@ -475,12 +475,12 @@ class ArDetector {
       // letterbox also needs to be corrected:
       //   letterbox += [video.zoomedHeight] - [video.unzoomedHeight]
 
-      var vbr = this.video.getBoundingClientRect();
+      let vbr = this.video.getBoundingClientRect();
       
       zoomFactor = vbr.height / this.video.clientHeight;
       letterbox += vbr.height - this.video.clientHeight;
 
-      var trueHeight = this.canvas.height * zoomFactor - letterbox;
+      let trueHeight = this.canvas.height * zoomFactor - letterbox;
 
       if(edges.top > 1 && edges.top <= this.settings.active.arDetect.fallbackMode.noTriggerZonePx ){
         this.logger.log('info', 'arDetect', `%c[ArDetect::calculateArFromEdges] <@${this.arid}>  Edge is in the no-trigger zone. Aspect ratio change is not triggered.`)
@@ -549,7 +549,7 @@ class ArDetector {
       this.init();
     }
     
-    var startTime = performance.now();
+    let startTime = performance.now();
     let sampleCols = this.sampleCols.slice(0);
 
     //
@@ -724,7 +724,7 @@ class ArDetector {
     
     // blackSamples -> {res_top, res_bottom}
    
-    var edgePost = this.edgeDetector.findBars(imageData, sampleCols, EdgeDetectPrimaryDirection.VERTICAL, EdgeDetectQuality.IMPROVED, guardLineOut, bfanalysis);
+    let edgePost = this.edgeDetector.findBars(imageData, sampleCols, EdgeDetectPrimaryDirection.VERTICAL, EdgeDetectQuality.IMPROVED, guardLineOut, bfanalysis);
     
     this.logger.log('info', 'arDetect_verbose', `%c[ArDetect::frameCheck] edgeDetector returned this\n`,  "color: #aaf", edgePost);
     
@@ -737,7 +737,7 @@ class ArDetector {
       return;
     }
 
-    var newAr = this.calculateArFromEdges(edgePost);
+    let newAr = this.calculateArFromEdges(edgePost);
       
     this.logger.log('info', 'arDetect_verbose', `%c[ArDetect::frameCheck] Triggering aspect ration change! new ar: ${newAr}`, "color: #aaf");
 
@@ -930,7 +930,7 @@ class ArDetector {
   
     // detect black level. if currentMax comes above blackbar + blackbar threshold, we know we aren't letterboxed
 
-    for (var i = 0; i < sampleCols.length; ++i){
+    for (let i = 0; i < sampleCols.length; ++i){
       colOffset_r = sampleCols[i] << 2;
       colOffset_g = colOffset_r + 1;
       colOffset_b = colOffset_r + 2;
@@ -966,8 +966,8 @@ class ArDetector {
 
 }
 
-var _ard_console_stop = "background: #000; color: #f41";
-var _ard_console_start = "background: #000; color: #00c399";
-var _ard_console_change = "background: #000; color: #ff8";
+let _ard_console_stop = "background: #000; color: #f41";
+let _ard_console_start = "background: #000; color: #00c399";
+let _ard_console_change = "background: #000; color: #ff8";
 
 export default ArDetector;
diff --git a/src/ext/lib/ar-detect/GuardLine.ts b/src/ext/lib/ar-detect/GuardLine.ts
index b3bc7dc..af196a4 100644
--- a/src/ext/lib/ar-detect/GuardLine.ts
+++ b/src/ext/lib/ar-detect/GuardLine.ts
@@ -48,8 +48,8 @@ class GuardLine {
   }
 
   setBlackbar(bbconf){
-    var bbTop = bbconf.top - this.settings.active.arDetect.guardLine.edgeTolerancePx;
-    var bbBottom = bbconf.bottom + this.settings.active.arDetect.guardLine.edgeTolerancePx;
+    let bbTop = bbconf.top - this.settings.active.arDetect.guardLine.edgeTolerancePx;
+    let bbBottom = bbconf.bottom + this.settings.active.arDetect.guardLine.edgeTolerancePx;
 
     // to odstrani vse neveljavne nastavitve in vse možnosti, ki niso smiselne
     // this removes any configs with invalid values or values that dont make sense
@@ -76,7 +76,7 @@ class GuardLine {
 
     // dejansko testiranje
     // actual checks
-    var guardLineResult = this.guardLineCheck(image, fallbackMode);
+    let guardLineResult = this.guardLineCheck(image, fallbackMode);
 
     // Zaznali smo kršitev črnega dela, zato nam ni treba preveriti, ali je slika
     // prisotna. Vemo namreč, da se je razmerje stranic zmanjšalo.
@@ -91,7 +91,7 @@ class GuardLine {
       }
     }
 
-    var imageCheckResult = this.imageCheck(image, fallbackMode);
+    let imageCheckResult = this.imageCheck(image, fallbackMode);
 
     return {
       blackbarFail: false,
@@ -115,27 +115,28 @@ class GuardLine {
       return { success: true };
     }
 
-    var offset = (this.aard.canvas.width * this.settings.active.arDetect.guardLine.ignoreEdgeMargin) << 2;
+    let offset = (this.aard.canvas.width * this.settings.active.arDetect.guardLine.ignoreEdgeMargin) << 2;
     
-    var offenders = [];
-    var offenderCount = -1; // doing it this way means first offender has offenderCount==0. Ez index.
+    let offenders = [];
+    let offenderCount = -1; // doing it this way means first offender has offenderCount==0. Ez index.
     
     // TODO: implement logo check.
     
     // preglejmo obe vrstici
     // check both rows
-    
+    let edge_lower, edge_upper;
+
     if(! fallbackMode){
-      var edge_upper = this.blackbar.top;
-      var edge_lower = this.blackbar.bottom;
+      edge_upper = this.blackbar.top;
+      edge_lower = this.blackbar.bottom;
     }
-    else{
+    else {
       // fallback mode is a bit different
       edge_upper = 0;
       edge_lower = this.aard.canvas.height - 1;
     }
     
-    var rowStart, rowEnd;
+    let rowStart, rowEnd;
     
     // <<<=======| checking upper row |========>>>
     
@@ -168,8 +169,8 @@ class GuardLine {
       return {success: true};
     }
     
-    var ret = new Array(offenders.length);
-    for(var o in offenders){
+    let ret = new Array(offenders.length);
+    for(let o in offenders){
       ret[o] = offenders[o].x + (offenders[o].width * 0.25);
     }
     
@@ -180,7 +181,7 @@ class GuardLine {
     if(!this.imageBar.top || !this.imageBar.bottom)
       return { success: false };
         
-    var offset = (this.aard.canvas.width * this.settings.active.arDetect.guardLine.ignoreEdgeMargin) << 2;
+    let offset = (this.aard.canvas.width * this.settings.active.arDetect.guardLine.ignoreEdgeMargin) << 2;
       
     // TODO: implement logo check.
     
@@ -189,20 +190,20 @@ class GuardLine {
     // check both rows - by the rules and definitions, we shouldn't go out of bounds here. no need to check, then
     
     //   if(fallbackMode){
-    //     var edge_upper = this.settings.active.arDetect.fallbackMode.noTriggerZonePx;
-    //     var edge_lower = this.conf.canvas.height - this.settings.active.arDetect.fallbackMode.noTriggerZonePx - 1;
+    //     let edge_upper = this.settings.active.arDetect.fallbackMode.noTriggerZonePx;
+    //     let edge_lower = this.conf.canvas.height - this.settings.active.arDetect.fallbackMode.noTriggerZonePx - 1;
     //   }
     //   else{
-        var edge_upper = this.imageBar.top;
-        var edge_lower = this.imageBar.bottom;
+        let edge_upper = this.imageBar.top;
+        let edge_lower = this.imageBar.bottom;
     //   }
     
     // koliko pikslov rabimo zaznati, da je ta funkcija uspe. Tu dovoljujemo tudi, da so vsi piksli na enem
     // robu (eden izmed robov je lahko v celoti črn)
     // how many non-black pixels we need to consider this check a success. We only need to detect enough pixels
     // on one edge (one of the edges can be black as long as both aren't)
-    var successThreshold = (this.aard.canvas.width * this.settings.active.arDetect.guardLine.imageTestThreshold);
-    var rowStart, rowEnd;
+    let successThreshold = (this.aard.canvas.width * this.settings.active.arDetect.guardLine.imageTestThreshold);
+    let rowStart, rowEnd;
     
     
     // <<<=======| checking upper row |========>>>
@@ -210,7 +211,7 @@ class GuardLine {
     rowStart = ((edge_upper * this.aard.canvas.width) << 2) + offset;
     rowEnd = rowStart + ( this.aard.canvas.width << 2 ) - (offset * 2);
     
-    var res = false;
+    let res = false;
     
     if(Debug.debugCanvas.enabled && Debug.debugCanvas.guardLine){
       // res = this._ti_debugCheckRow(image, rowStart, rowEnd, successThreshold);
@@ -242,8 +243,8 @@ class GuardLine {
 
 
   _gl_rowCheck(image, rowStart, rowEnd, offenders, offenderCount){
-    var firstOffender = -1;
-    for(var i = rowStart; i < rowEnd; i+=4){
+    let firstOffender = -1;
+    for(let i = rowStart; i < rowEnd; i+=4){
       
       // we track sections that go over what's supposed to be a black line, so we can suggest more 
       // columns to sample
@@ -267,8 +268,8 @@ class GuardLine {
   }
 
   // _gl_debugRowCheck(image, rowStart, rowEnd, offenders, offenderCount){
-  //   var firstOffender = -1;
-  //   for(var i = rowStart; i < rowEnd; i+=4){
+  //   let firstOffender = -1;
+  //   for(let i = rowStart; i < rowEnd; i+=4){
       
   //     // we track sections that go over what's supposed to be a black line, so we can suggest more 
   //     // columns to sample
@@ -295,7 +296,7 @@ class GuardLine {
   // }
 
   _ti_checkRow(image, rowStart, rowEnd, successThreshold): boolean {
-    for(var i = rowStart; i < rowEnd; i+=4){
+    for(let i = rowStart; i < rowEnd; i+=4){
       if(image[i] > this.imageThreshold || image[i+1] > this.imageThreshold || image[i+2] > this.imageThreshold){
         if(successThreshold --<= 0){
           return true;
@@ -307,7 +308,7 @@ class GuardLine {
   }
 
   // _ti_debugCheckRow(image, rowStart, rowEnd, successThreshold) {
-  //   for(var i = rowStart; i < rowEnd; i+=4){
+  //   for(let i = rowStart; i < rowEnd; i+=4){
   //     if(image[i] > this.imageThreshold || image[i+1] > this.imageThreshold || image[i+2] > this.imageThreshold){
   //       this.aard.debugCanvas.trace(i, DebugCanvasClasses.GUARDLINE_IMAGE);
   //       if(successThreshold --<= 0){
diff --git a/src/ext/lib/ar-detect/edge-detect/EdgeDetect.ts b/src/ext/lib/ar-detect/edge-detect/EdgeDetect.ts
index 299bb86..bc11efa 100644
--- a/src/ext/lib/ar-detect/edge-detect/EdgeDetect.ts
+++ b/src/ext/lib/ar-detect/edge-detect/EdgeDetect.ts
@@ -128,10 +128,10 @@ class EdgeDetect{
 
       this.logger.log('info', 'arDetect', '[EdgeDetect::findCandidates] searching for candidates on ranges', upper_top, '<->', upper_bottom, ';', lower_top, '<->', lower_bottom);
       
-      var upper_top_corrected = upper_top * this.conf.canvasImageDataRowLength;
-      var upper_bottom_corrected = upper_bottom * this.conf.canvasImageDataRowLength;
-      var lower_top_corrected = lower_top * this.conf.canvasImageDataRowLength;
-      var lower_bottom_corrected = lower_bottom * this.conf.canvasImageDataRowLength;
+      let upper_top_corrected = upper_top * this.conf.canvasImageDataRowLength;
+      let upper_bottom_corrected = upper_bottom * this.conf.canvasImageDataRowLength;
+      let lower_top_corrected = lower_top * this.conf.canvasImageDataRowLength;
+      let lower_bottom_corrected = lower_bottom * this.conf.canvasImageDataRowLength;
       
       // if(Debug.debugCanvas.enabled){
         // this._columnTest_dbgc(image, upper_top_corrected, upper_bottom_corrected, cols_a, res_top, false);
@@ -236,20 +236,20 @@ class EdgeDetect{
   }
 
   edgeDetect(image, samples){
-    var edgeCandidatesTop = {count: 0};
-    var edgeCandidatesBottom = {count: 0};
+    let edgeCandidatesTop = {count: 0};
+    let edgeCandidatesBottom = {count: 0};
     
-    var detections;
-    var canvasWidth = this.conf.canvas.width;
-    var canvasHeight = this.conf.canvas.height;
+    let detections;
+    let canvasWidth = this.conf.canvas.width;
+    let canvasHeight = this.conf.canvas.height;
     
-    var sampleStart, sampleEnd, loopEnd;
-    var sampleRow_black, sampleRow_color;
+    let sampleStart, sampleEnd, loopEnd;
+    let sampleRow_black, sampleRow_color;
     
-    var blackEdgeViolation = false;
+    let blackEdgeViolation = false;
     
-    var topEdgeCount = 0;
-    var bottomEdgeCount = 0;
+    let topEdgeCount = 0;
+    let bottomEdgeCount = 0;
       
     try {
       for (const sample of samples.res_top){
@@ -350,11 +350,11 @@ class EdgeDetect{
   }
 
   edgePostprocess(edges){
-    var edgesTop = [];
-    var edgesBottom = [];
-    var alignMargin = this.conf.canvas.height * this.settings.active.arDetect.allowedMisaligned;
+    let edgesTop = [];
+    let edgesBottom = [];
+    let alignMargin = this.conf.canvas.height * this.settings.active.arDetect.allowedMisaligned;
     
-    var missingEdge = edges.edgeCandidatesTopCount == 0 || edges.edgeCandidatesBottomCount == 0;
+    let missingEdge = edges.edgeCandidatesTopCount == 0 || edges.edgeCandidatesBottomCount == 0;
     
     // pretvorimo objekt v tabelo
     // convert objects to array
@@ -363,8 +363,8 @@ class EdgeDetect{
     delete(edges.edgeCandidatesBottom.count);
 
     if( edges.edgeCandidatesTopCount > 0){
-      for(var e in edges.edgeCandidatesTop){
-        var edge = edges.edgeCandidatesTop[e];
+      for(let e in edges.edgeCandidatesTop){
+        let edge = edges.edgeCandidatesTop[e];
         edgesTop.push({
           distance: edge.offset,
           absolute: edge.offset,
@@ -374,8 +374,8 @@ class EdgeDetect{
     }
     
     if( edges.edgeCandidatesBottomCount > 0){
-      for(var e in edges.edgeCandidatesBottom){
-        var edge = edges.edgeCandidatesBottom[e];
+      for(let e in edges.edgeCandidatesBottom){
+        let edge = edges.edgeCandidatesBottom[e];
         edgesBottom.push({
           distance: this.conf.canvas.height - edge.offset,
           absolute: edge.offset,
@@ -403,7 +403,7 @@ class EdgeDetect{
       if( edgesTop[0].distance >= edgesBottom[0].distance - alignMargin &&
           edgesTop[0].distance <= edgesBottom[0].distance + alignMargin ){
         
-        var blackbarWidth = edgesTop[0].distance > edgesBottom[0].distance ? 
+        let blackbarWidth = edgesTop[0].distance > edgesBottom[0].distance ? 
                             edgesTop[0].distance : edgesBottom[0].distance;
         
         if (edgesTop[0].count + edgesBottom[0].count > this.settings.active.arDetect.edgeDetection.singleSideConfirmationThreshold
@@ -430,14 +430,14 @@ class EdgeDetect{
         // manj vzorcev kot navaden rob.
         
         if (edgesTop[0].length > 1){
-          var lowMargin = edgesBottom[0].distance - alignMargin;
-          var highMargin = edgesBottom[0].distance + alignMargin;
+          let lowMargin = edgesBottom[0].distance - alignMargin;
+          let highMargin = edgesBottom[0].distance + alignMargin;
           
-          for (var i = 1; i < edgesTop.length; i++){
+          for (let i = 1; i < edgesTop.length; i++){
             if(edgesTop[i].distance >= lowMargin && edgesTop[i].distance <= highMargin){
               // dobili smo dejanski rob. vrnimo ga
               // we found the actual edge. let's return that.
-              var blackbarWidth = edgesTop[i].distance > edgesBottom[0].distance ? 
+              let blackbarWidth = edgesTop[i].distance > edgesBottom[0].distance ? 
                                   edgesTop[i].distance : edgesBottom[0].distance;
 
               if (edgesTop[i].count + edgesBottom[0].count > this.settings.active.arDetect.edgeDetection.singleSideConfirmationThreshold
@@ -461,14 +461,14 @@ class EdgeDetect{
           edgesBottom[0].count    < this.conf.sampleCols.length * this.settings.active.arDetect.edgeDetection.logoThreshold){
         
         if(edgesBottom[0].length > 1){
-          var lowMargin = edgesTop[0].distance - alignMargin;
-          var highMargin = edgesTop[0].distance + alignMargin;
+          let lowMargin = edgesTop[0].distance - alignMargin;
+          let highMargin = edgesTop[0].distance + alignMargin;
           
-          for(var i = 1; i < edgesBottom.length; i++){
+          for(let i = 1; i < edgesBottom.length; i++){
             if (edgesBottom[i].distance >= lowMargin && edgesTop[i].distance <= highMargin) {
               // dobili smo dejanski rob. vrnimo ga
               // we found the actual edge. let's return that.
-              var blackbarWidth = edgesBottom[i].distance > edgesTop[0].distance ? 
+              let blackbarWidth = edgesBottom[i].distance > edgesTop[0].distance ? 
                                   edgesBottom[i].distance : edgesTop[0].distance;
               
               if (edgesTop[0].count + edgesBottom[i].count > this.settings.active.arDetect.edgeDetection.singleSideConfirmationThreshold
@@ -497,7 +497,7 @@ class EdgeDetect{
       const edgeDetectionThreshold = this.settings.active.arDetect.edgeDetection.singleSideConfirmationThreshold;
       
       if (edges.edgeCandidatesTopCount == 0 && edges.edgeCandidatesBottomCount != 0){
-        for(var edge of edgesBottom){
+        for(let edge of edgesBottom){
           if(edge.count >= edgeDetectionThreshold)
             return {
               status: EdgeStatus.AR_KNOWN, 
@@ -511,7 +511,7 @@ class EdgeDetect{
         }
       }
       if (edges.edgeCandidatesTopCount != 0 && edges.edgeCandidatesBottomCount == 0){
-        for(var edge of edgesTop){
+        for(let edge of edgesTop){
           if(edge.count >= edgeDetectionThreshold)
             return {
               status: EdgeStatus.AR_KNOWN,
@@ -538,22 +538,22 @@ class EdgeDetect{
     // roughly centered, we return true. Otherwise we return false.
     // we also return true if we detect too much black
   
-    var blackbarThreshold, upper, lower;
+    let blackbarThreshold, upper, lower;
     blackbarThreshold = this.conf.blackLevel + this.settings.active.arDetect.blackbar.threshold;
   
   
-    var middleRowStart = (this.conf.canvas.height >> 1) * this.conf.canvas.width;
-    var middleRowEnd = middleRowStart + this.conf.canvas.width - 1;
+    let middleRowStart = (this.conf.canvas.height >> 1) * this.conf.canvas.width;
+    let middleRowEnd = middleRowStart + this.conf.canvas.width - 1;
   
-    var rowStart = middleRowStart << 2;
-    var midpoint = (middleRowStart + (this.conf.canvas.width >> 1)) << 2
-    var rowEnd = middleRowEnd << 2;
+    let rowStart = middleRowStart << 2;
+    let midpoint = (middleRowStart + (this.conf.canvas.width >> 1)) << 2
+    let rowEnd = middleRowEnd << 2;
   
-    var edge_left = -1, edge_right = -1;
+    let edge_left = -1, edge_right = -1;
   
     // preverimo na levi strani
     // let's check for edge on the left side
-    for(var i = rowStart; i < midpoint; i+=4){
+    for(let i = rowStart; i < midpoint; i+=4){
       if(image[i] > blackbarThreshold || image[i+1] > blackbarThreshold || image[i+2] > blackbarThreshold){
         edge_left = (i - rowStart) >> 2;
         break;
@@ -562,7 +562,7 @@ class EdgeDetect{
   
     // preverimo na desni strani
     // check on the right
-    for(var i = rowEnd; i > midpoint; i-= 4){
+    for(let i = rowEnd; i > midpoint; i-= 4){
       if(image[i] > blackbarThreshold || image[i+1] > blackbarThreshold || image[i+2] > blackbarThreshold){
         edge_right =  this.conf.canvas.width - ((i - rowStart) >> 2);
         break;
@@ -581,9 +581,9 @@ class EdgeDetect{
       return false;
     }
   
-    var edgeError = this.settings.active.arDetect.pillarTest.allowMisaligned;
-    var error_low = 1 - edgeError;
-    var error_hi = 1 + edgeError;
+    let edgeError = this.settings.active.arDetect.pillarTest.allowMisaligned;
+    let error_low = 1 - edgeError;
+    let error_hi = 1 + edgeError;
   
     // če sta 'edge_left' in 'edge_right' podobna/v mejah merske napake, potem vrnemo true — lahko da smo našli logo na sredini zaslona
     // if 'edge_left' and 'edge_right' are similar enough to each other, we return true. If we found a logo in a black frame, we could
@@ -869,7 +869,7 @@ class EdgeDetect{
     if (reverseSearchDirection) {
       if (this.settings.active.arDetect.blackbar.antiGradientMode === AntiGradientMode.Disabled) {
         // todo: remove gradient detection code from this branch
-        for(var i = bottom - this.conf.canvasImageDataRowLength; i >= top; i-= this.conf.canvasImageDataRowLength){
+        for(let i = bottom - this.conf.canvasImageDataRowLength; i >= top; i-= this.conf.canvasImageDataRowLength){
           for(let c = 0; c < colsIn.length; c++){
             if (colsIn[c].blackFound && colsIn[c].imageFound) {
               // če smo našli obe točki, potem ne pregledujemo več.
@@ -923,7 +923,7 @@ class EdgeDetect{
         }
       } else {
         // anti-gradient detection
-        for(var i = bottom - this.conf.canvasImageDataRowLength; i >= top; i-= this.conf.canvasImageDataRowLength){
+        for(let i = bottom - this.conf.canvasImageDataRowLength; i >= top; i-= this.conf.canvasImageDataRowLength){
           for(let c = 0; c < colsIn.length; c++){
             if (colsIn[c].blackFound && colsIn[c].imageFound) {
               // če smo našli obe točki, potem ne pregledujemo več.
@@ -1111,17 +1111,17 @@ class EdgeDetect{
   }
 
   // _columnTest_dbgc(image, top, bottom, colsIn, colsOut, reverseSearchDirection){
-  //   var tmpI;
+  //   let tmpI;
   //   if(reverseSearchDirection){
-  //     for(var i = bottom - this.conf.canvasImageDataRowLength; i >= top; i-= this.conf.canvasImageDataRowLength){
-  //       for(var col of colsIn){
+  //     for(let i = bottom - this.conf.canvasImageDataRowLength; i >= top; i-= this.conf.canvasImageDataRowLength){
+  //       for(let col of colsIn){
   //         tmpI = i + (col << 2);
           
   //         if( image[tmpI]     > this.blackbarThreshold || 
   //             image[tmpI + 1] > this.blackbarThreshold ||
   //             image[tmpI + 2] > this.blackbarThreshold ){
             
-  //           var bottom = (i / this.conf.canvasImageDataRowLength) + 1;
+  //           let bottom = (i / this.conf.canvasImageDataRowLength) + 1;
   //           colsOut.push({
   //             col: col,
   //             bottom: bottom
@@ -1137,8 +1137,8 @@ class EdgeDetect{
   //         break;
   //     }
   //   } else {
-  //     for(var i = top; i < bottom; i+= this.conf.canvasImageDataRowLength){
-  //       for(var col of colsIn){
+  //     for(let i = top; i < bottom; i+= this.conf.canvasImageDataRowLength){
+  //       for(let col of colsIn){
   //         tmpI = i + (col << 2);
           
   //         if( image[tmpI]     > this.blackbarThreshold || 
@@ -1168,7 +1168,7 @@ class EdgeDetect{
   // }
 
   _blackbarTest(image, start, end){
-    for(var i = start; i < end; i += 4){
+    for(let i = start; i < end; i += 4){
       if( image[i  ] > this.blackbarThreshold ||
           image[i+1] > this.blackbarThreshold ||
           image[i+2] > this.blackbarThreshold ){
@@ -1179,7 +1179,7 @@ class EdgeDetect{
   }
 
   // _blackbarTest_dbg(image, start, end){
-  //   for(var i = start; i < end; i += 4){
+  //   for(let i = start; i < end; i += 4){
   //     if( image[i  ] > this.blackbarThreshold ||
   //         image[i+1] > this.blackbarThreshold ||
   //         image[i+2] > this.blackbarThreshold ){
@@ -1214,9 +1214,9 @@ class EdgeDetect{
   }
 
   // _imageTest_dbg(image, start, end, sampleOffset, edgeCandidates){
-  //   var detections = 0;
+  //   let detections = 0;
 
-  //   for(var i = start; i < end; i += 4){
+  //   for(let i = start; i < end; i += 4){
   //     if( image[i  ] > this.blackbarThreshold ||
   //       image[i+1] > this.blackbarThreshold ||
   //       image[i+2] > this.blackbarThreshold ){
diff --git a/src/ext/lib/video-data/PageInfo.ts b/src/ext/lib/video-data/PageInfo.ts
index 370424f..03a31af 100644
--- a/src/ext/lib/video-data/PageInfo.ts
+++ b/src/ext/lib/video-data/PageInfo.ts
@@ -111,7 +111,7 @@ class PageInfo {
     if(this.rescanTimer){
       clearTimeout(this.rescanTimer);
     }
-    for (var video of this.videos) {
+    for (let video of this.videos) {
       try {
         (this.comms.unregisterVideo as any)(video.vdid)
         video.destroy();
@@ -134,7 +134,7 @@ class PageInfo {
   }
 
   reset() {
-    for(var video of this.videos) {
+    for(let video of this.videos) {
       video.destroy();
     }
     this.rescan(RescanReason.MANUAL);
@@ -150,7 +150,7 @@ class PageInfo {
 
   setActionHandler(actionHandler) {
     this.actionHandler = actionHandler;
-    for (var item of this.actionHandlerInitQueue) {
+    for (let item of this.actionHandlerInitQueue) {
       this.actionHandler.registerHandleMouse(item);
     }
     this.actionHandlerInitQueue = [];
@@ -176,7 +176,7 @@ class PageInfo {
     const oldVideoCount = this.videos.length;
 
     try{
-      var vids = this.getVideos(window.location.hostname);
+      let vids = this.getVideos(window.location.hostname);
 
       if(!vids || vids.length == 0){
         this.hasVideos = false;
@@ -190,8 +190,8 @@ class PageInfo {
 
       // add new videos
       this.hasVideos = false;
-      var videoExists = false;    
-      var video, v;
+      let videoExists = false;    
+      let video, v;
 
       for (video of vids) {
         // če najdemo samo en video z višino in širino, to pomeni, da imamo na strani veljavne videe
@@ -314,7 +314,7 @@ class PageInfo {
         clearTimeout(this.rescanTimer);
       }
 
-      var ths = this;
+      let ths = this;
       
       this.rescanTimer = setTimeout(function(rescanReason){
         ths.rescanTimer = null;
@@ -332,7 +332,7 @@ class PageInfo {
       clearTimeout(this.urlCheckTimer);
     }
 
-    var ths = this;
+    let ths = this;
         
     this.urlCheckTimer = setTimeout(function(){
       ths.urlCheckTimer = null;
@@ -357,14 +357,14 @@ class PageInfo {
 
   initArDetection(playingOnly){
     if (playingOnly) {
-      for(var vd of this.videos){
+      for(let vd of this.videos){
         if(vd.isPlaying()) {
           vd.initArDetection();
         }
       }
       return;
     } else {
-      for(var vd of this.videos){
+      for(let vd of this.videos){
         vd.initArDetection();
       }
     }
@@ -375,13 +375,13 @@ class PageInfo {
   // these need to be called on tab switch
   pauseProcessing(playingOnly){
     if (playingOnly) {
-      for(var vd of this.videos){
+      for(let vd of this.videos){
         if (vd.isPlaying()) {
           vd.pause();
         }
       }  
     } else {
-      for(var vd of this.videos){
+      for(let vd of this.videos){
         vd.pause();
       }
     }
@@ -389,7 +389,7 @@ class PageInfo {
 
   resumeProcessing(resumeAutoar = false, playingOnly = false){
     if (playingOnly) {
-      for(var vd of this.videos){
+      for(let vd of this.videos){
         if (vd.isPlaying()) {
           vd.resume();
           if(resumeAutoar){
@@ -398,7 +398,7 @@ class PageInfo {
         }
       }
     } else {
-      for(var vd of this.videos){
+      for(let vd of this.videos){
         vd.resume();
         if(resumeAutoar){
           vd.resumeAutoAr();
@@ -413,13 +413,13 @@ class PageInfo {
       this.logger.log('info', 'debug', '[PageInfo::startArDetection()] starting automatic ar detection!')
     }
     if (playingOnly) {
-      for(var vd of this.videos){
+      for(let vd of this.videos){
         if (vd.isPlaying()) {
           vd.startArDetection();
         }
       }
     } else {
-      for(var vd of this.videos){
+      for(let vd of this.videos){
         vd.startArDetection();
       }
     }
@@ -427,13 +427,13 @@ class PageInfo {
 
   stopArDetection(playingOnly){
     if (playingOnly) {
-      for(var vd of this.videos){
+      for(let vd of this.videos){
         if (vd.isPlaying()) { 
           vd.stopArDetection();
         }
       }
     } else {
-      for(var vd of this.videos){
+      for(let vd of this.videos){
         vd.stopArDetection();
       }
     }
@@ -448,7 +448,7 @@ class PageInfo {
       this.logger.log('info', 'debug', '[PageInfo::setAr] aspect ratio is auto');
 
       try {
-        for (var vd of this.videos) {
+        for (let vd of this.videos) {
           if (!playingOnly || vd.isPlaying()) {
             vd.resetLastAr();
           }
@@ -463,13 +463,13 @@ class PageInfo {
 
     // TODO: find a way to only change aspect ratio for one video
     if (ar === AspectRatioType.Reset) {
-      for (var vd of this.videos) {
+      for (let vd of this.videos) {
         if (!playingOnly || vd.isPlaying()) {
           vd.resetAr();
         }
       }
     } else {
-      for (var vd of this.videos) {
+      for (let vd of this.videos) {
         if (!playingOnly || vd.isPlaying()) {
           vd.setAr(ar)
         }
@@ -479,13 +479,13 @@ class PageInfo {
   
   setVideoAlignment(videoAlignment, playingOnly) {
     if (playingOnly) {
-      for(var vd of this.videos) {
+      for(let vd of this.videos) {
         if (vd.isPlaying()) { 
           vd.setVideoAlignment(videoAlignment)
         }
       }
     } else {
-      for(var vd of this.videos) {
+      for(let vd of this.videos) {
         vd.setVideoAlignment(videoAlignment)
       }
     }
@@ -493,13 +493,13 @@ class PageInfo {
 
   setPanMode(mode, playingOnly) {
     if (playingOnly) {
-      for(var vd of this.videos) {
+      for(let vd of this.videos) {
         if (vd.isPlaying()) {
           vd.setPanMode(mode);
         }
       }
     } else {
-      for(var vd of this.videos) {
+      for(let vd of this.videos) {
         vd.setPanMode(mode);
       }
     }
@@ -507,13 +507,13 @@ class PageInfo {
 
   restoreAr(playingOnly) {
     if (playingOnly) {
-      for(var vd of this.videos){
+      for(let vd of this.videos){
         if (vd.isPlaying()) {
           vd.restoreAr();
         }
       }
     } else {
-      for(var vd of this.videos){
+      for(let vd of this.videos){
         vd.restoreAr();
       }
     }
@@ -523,13 +523,13 @@ class PageInfo {
     // TODO: find a way to only change aspect ratio for one video
 
     if (playingOnly) {
-      for(var vd of this.videos){
+      for(let vd of this.videos){
         if (vd.isPlaying()) {
           vd.setStretchMode(stretchMode, fixedStretchRatio)
         }
       }
     } else {
-      for(var vd of this.videos){
+      for(let vd of this.videos){
         vd.setStretchMode(stretchMode, fixedStretchRatio)
       }
     }
@@ -537,20 +537,20 @@ class PageInfo {
 
   setZoom(zoomLevel, no_announce, playingOnly) {
     if (playingOnly) {
-      for(var vd of this.videos) {
+      for(let vd of this.videos) {
         if (vd.isPlaying()) {
           vd.setZoom(zoomLevel, no_announce);
         }
       }
     } else {
-      for(var vd of this.videos) {
+      for(let vd of this.videos) {
         vd.setZoom(zoomLevel, no_announce);
       }
     }
   }
 
   zoomStep(step, playingOnly) {
-    for(var vd of this.videos){
+    for(let vd of this.videos){
       if (!playingOnly || vd.isPlaying()) {
         vd.zoomStep(step);
       }
@@ -558,12 +558,12 @@ class PageInfo {
   }
 
   markPlayer(name, color) { 
-    for (var vd of this.videos) {
+    for (let vd of this.videos) {
       vd.markPlayer(name,color);
     }
   }
   unmarkPlayer() {
-    for (var vd of this.videos) {
+    for (let vd of this.videos) {
       vd.unmarkPlayer();
     }
   }
@@ -578,13 +578,13 @@ class PageInfo {
   }
 
   setManualTick(manualTick) {
-    for(var vd of this.videos) {
+    for(let vd of this.videos) {
       vd.setManualTick(manualTick);
     }
   }
 
   tick() {
-    for(var vd of this.videos) {
+    for(let vd of this.videos) {
       vd.tick();
     }
   }
diff --git a/src/ext/lib/video-data/PlayerData.ts b/src/ext/lib/video-data/PlayerData.ts
index 075c7a7..4c63d8a 100644
--- a/src/ext/lib/video-data/PlayerData.ts
+++ b/src/ext/lib/video-data/PlayerData.ts
@@ -207,7 +207,7 @@ class PlayerData {
       this.destroyOverlay();
     }
 
-    var overlay = document.createElement('div');
+    let overlay = document.createElement('div');
     overlay.style.width = '100%';
     overlay.style.height = '100%';
     overlay.style.position = 'absolute';
diff --git a/src/ext/lib/video-transform/CssHandler.ts b/src/ext/lib/video-transform/CssHandler.ts
index ec04fe1..eb6c693 100644
--- a/src/ext/lib/video-transform/CssHandler.ts
+++ b/src/ext/lib/video-transform/CssHandler.ts
@@ -24,7 +24,7 @@ class CssHandler {
         }
       }
   
-      for (var i in styleArray) {
+      for (let i in styleArray) {
         styleArray[i] = styleArray[i].trim();   
         // some sites do 'top: 50%; left: 50%; transform: <transform>' to center videos. 
         // we dont wanna, because we already center videos on our own
@@ -45,7 +45,7 @@ class CssHandler {
   static buildStyleString(styleArray) {
     let styleString = '';
 
-    for(var i in styleArray) {
+    for(let i in styleArray) {
       if(styleArray[i]) {
         styleString += styleArray[i] + "; ";
       }
diff --git a/src/ext/lib/video-transform/Resizer.ts b/src/ext/lib/video-transform/Resizer.ts
index 5b5fd95..4788437 100644
--- a/src/ext/lib/video-transform/Resizer.ts
+++ b/src/ext/lib/video-transform/Resizer.ts
@@ -104,7 +104,7 @@ class Resizer {
     // Skrbi za "stare" možnosti, kot na primer "na širino zaslona", "na višino zaslona" in "ponastavi". 
     // Približevanje opuščeno.
     // handles "legacy" options, such as 'fit to widht', 'fit to height' and AspectRatioType.Reset. No zoom tho
-    var ratioOut;
+    let ratioOut;
 
     if (!this.conf.video) {
       this.logger.log('info', 'debug', "[Scaler.js::modeToAr] No video??",this.conf.video, "killing videoData");
@@ -126,7 +126,7 @@ class Resizer {
     // IMPORTANT NOTE: lastAr needs to be set after _res_setAr() is called, as _res_setAr() assumes we're
     // setting a static aspect ratio (even if the function is called from here or ArDetect). 
     
-    var fileAr = this.conf.video.videoWidth / this.conf.video.videoHeight;
+    let fileAr = this.conf.video.videoWidth / this.conf.video.videoHeight;
       
     if (ar.type === AspectRatioType.FitWidth){
       ar.ratio = ratioOut > fileAr ? ratioOut : fileAr;
@@ -296,7 +296,7 @@ class Resizer {
 
     this.stretcher.chromeBugMitigation(stretchFactors);
 
-    var translate = this.computeOffsets(stretchFactors);
+    let translate = this.computeOffsets(stretchFactors);
 
 
     console.log("aspect ratio will be set. stretch factors:", stretchFactors, "translate:", translate);
@@ -603,7 +603,7 @@ class Resizer {
         }
       }
   
-      for (var i in styleArray) {
+      for (let i in styleArray) {
         styleArray[i] = styleArray[i].trim();   
         // some sites do 'top: 50%; left: 50%; transform: <transform>' to center videos. 
         // we dont wanna, because we already center videos on our own
@@ -626,7 +626,7 @@ class Resizer {
   buildStyleString(styleArray) {
     let styleString = '';
 
-    for(var i in styleArray) {
+    for(let i in styleArray) {
       if(styleArray[i]) {
         styleString += styleArray[i] + " !important; ";
       }
diff --git a/src/ext/lib/video-transform/Scaler.ts b/src/ext/lib/video-transform/Scaler.ts
index 25e0d94..ecb65cf 100644
--- a/src/ext/lib/video-transform/Scaler.ts
+++ b/src/ext/lib/video-transform/Scaler.ts
@@ -30,7 +30,7 @@ class Scaler {
       return ar.ratio; 
     }
 
-    var ratioOut;
+    let ratioOut;
 
     if (!this.conf.video) {
       this.logger.log('error', 'debug', "[Scaler.js::modeToAr] No video??",this.conf.video, "killing videoData");
@@ -51,7 +51,7 @@ class Scaler {
     // IMPORTANT NOTE: lastAr needs to be set after _res_setAr() is called, as _res_setAr() assumes we're
     // setting a static aspect ratio (even if the function is called from here or ArDetect). 
     
-    var fileAr = this.conf.video.videoWidth / this.conf.video.videoHeight;
+    let fileAr = this.conf.video.videoWidth / this.conf.video.videoHeight;
       
     if (ar.type === AspectRatioType.FitWidth) {
       ratioOut > fileAr ? ratioOut : fileAr
diff --git a/src/ext/lib/video-transform/Stretcher.ts b/src/ext/lib/video-transform/Stretcher.ts
index 6017b25..388b285 100644
--- a/src/ext/lib/video-transform/Stretcher.ts
+++ b/src/ext/lib/video-transform/Stretcher.ts
@@ -47,17 +47,17 @@ class Stretcher {
   }
 
   applyConditionalStretch(stretchFactors, actualAr){
-    var playerAr = this.conf.player.dimensions.width / this.conf.player.dimensions.height;
-    var videoAr = this.conf.video.videoWidth / this.conf.video.videoHeight;
+    let playerAr = this.conf.player.dimensions.width / this.conf.player.dimensions.height;
+    let videoAr = this.conf.video.videoWidth / this.conf.video.videoHeight;
 
     if (! actualAr){
       actualAr = playerAr;
     }
 
-    var newWidth = this.conf.video.offsetWidth * stretchFactors.xFactor;
-    var newHeight = this.conf.video.offsetHeight * stretchFactors.yFactor;
+    let newWidth = this.conf.video.offsetWidth * stretchFactors.xFactor;
+    let newHeight = this.conf.video.offsetHeight * stretchFactors.yFactor;
 
-    var actualWidth, actualHeight;
+    let actualWidth, actualHeight;
 
     // determine the dimensions of the video (sans black bars) after scaling
     if(actualAr < videoAr){
@@ -68,11 +68,11 @@ class Stretcher {
       actualWidth = newWidth;
     }
 
-    var minW = this.conf.player.dimensions.width * (1 - this.settings.active.stretch.conditionalDifferencePercent);
-    var maxW = this.conf.player.dimensions.width * (1 + this.settings.active.stretch.conditionalDifferencePercent);
+    let minW = this.conf.player.dimensions.width * (1 - this.settings.active.stretch.conditionalDifferencePercent);
+    let maxW = this.conf.player.dimensions.width * (1 + this.settings.active.stretch.conditionalDifferencePercent);
 
-    var minH = this.conf.player.dimensions.height * (1 - this.settings.active.stretch.conditionalDifferencePercent);
-    var maxH = this.conf.player.dimensions.height * (1 + this.settings.active.stretch.conditionalDifferencePercent);
+    let minH = this.conf.player.dimensions.height * (1 - this.settings.active.stretch.conditionalDifferencePercent);
+    let maxH = this.conf.player.dimensions.height * (1 + this.settings.active.stretch.conditionalDifferencePercent);
 
     if (actualWidth >= minW && actualWidth <= maxW) {
       stretchFactors.xFactor *= this.conf.player.dimensions.width / actualWidth;
@@ -168,7 +168,7 @@ squeezeFactor:          ${squeezeFactor}`, '\nvideo', this.conf.video);
       actualAr = playerAr;
     }
 
-    var stretchFactors: any = {
+    let stretchFactors: any = {
       xFactor: 1,
       yFactor: 1
     };