Fix firefox errors in cross-iframe communiccation

src/ext/module/EventBus.ts

@@ -99,14 +99,14 @@ export default class EventBus {
       commandId: context.commandId,
       comms: context.comms ? {
         forwardTo: context.comms.forwardTo,
-        sourceFrame: context.comms?.sourceFrame ? { ...context.comms?.sourceFrame } : undefined
+        sourceFrame: context.comms.sourceFrame ? { ...context.comms.sourceFrame } : undefined
       } : undefined,
       borderCrossings: context.borderCrossings ? { ...context.borderCrossings } : undefined
     };
   }
 
   send(command: string, commandData: any, context: EventBusContext = {}) {
-    context = this.cloneContext(context);  // Firefox throws an error if we don't clone the context.
+    context = this.cloneContext(context);
 
     if (context.visitedBusses?.includes(this.uuid)) {
       console.warn('this bus was already visited before. Doing nothing.');

src/ext/module/comms/CommsServer.ts

@@ -266,11 +266,11 @@ class CommsServer {
    * @param frame
    */
   private async sendToOtherFrames(message, context) {
-    const sender = context.comms?.sourceFrame;
+    const sender = context.comms.sourceFrame;
 
     const enrichedMessage = {
       message,
-      _sourceFrame: context.comms?.sourceFrame,
+      _sourceFrame: context.comms.sourceFrame,
       _sourcePort: context.comms.port
     }
 

src/ext/module/video-data/IframeManager.ts

@@ -99,14 +99,14 @@ export default class IframeManager {
     } else {
       this.iframeList.push({
         ...data,
-        ...context.comms?.sourceFrame
+        ...context.comms.sourceFrame
       });
     }
   }
 
   private handleFrameDestroyed(context) {
     // tab IDs should be the same for all items, making frameId sufficiently unique to filter stuff
-    this.iframeList = this.iframeList.filter(x => x.frameId !== context.comms?.sourceFrame?.frameId);
+    this.iframeList = this.iframeList.filter(x => x.frameId !== context.comms.sourceFrame.frameId);
   }
 
 }