diff --git a/src/ext/lib/video-transform/Resizer.js b/src/ext/lib/video-transform/Resizer.js
index cc07cc5..5fb32a6 100644
--- a/src/ext/lib/video-transform/Resizer.js
+++ b/src/ext/lib/video-transform/Resizer.js
@@ -650,7 +650,8 @@ class Resizer {
     if (!this.userCss) {
       this.injectCss(newCssString);
       this.userCss = newCssString;
-    } else {
+    } else if (newCssString !== this.userCss) {
+      // we only replace css if it
       this.replaceCss(this.userCss, newCssString);
       this.userCss = newCssString;
     }
diff --git a/src/ext/uw-bg.js b/src/ext/uw-bg.js
index 85e389b..e708f9b 100644
--- a/src/ext/uw-bg.js
+++ b/src/ext/uw-bg.js
@@ -69,16 +69,21 @@ class UWServer {
     }
   }
   async removeCss(css, sender) {
-    if (BrowserDetect.firefox || BrowserDetect.edge) {
-      browser.tabs.removeCSS(sender.tab.id, {code: css, cssOrigin: 'user', frameId: sender.frameId});
-    } else if (BrowserDetect.chrome) {
-      chrome.tabs.removeCSS(sender.tab.id, {code: css, cssOrigin: 'user', frameId: sender.frameId});
-    }
+    try {
+      if (BrowserDetect.firefox || BrowserDetect.edge) {
+        browser.tabs.removeCSS(sender.tab.id, {code: css, cssOrigin: 'user', frameId: sender.frameId});
+      } else if (BrowserDetect.chrome) {
+        // this doesn't work currently, but hopefully chrome will get this feature in the future
+        chrome.tabs.removeCSS(sender.tab.id, {code: css, cssOrigin: 'user', frameId: sender.frameId});
+      }
+    } catch (e) { }
   }
 
   async replaceCss(oldCss, newCss, sender) {
-    this.injectCss(newCss, sender);
-    this.removeCss(oldCss, sender);
+    if (oldCss !== newCss) {
+      this.injectCss(newCss, sender);
+      this.removeCss(oldCss, sender);
+    }
   }
 
   scheduleGc(timeout) {