daon't error if context isnt defined

src/ext/module/EventBus.ts

@@ -90,7 +90,24 @@ export default class EventBus {
     }
   }
 
+  private cloneContext(context: EventBusContext = {}): EventBusContext {
+    return {
+      stopPropagation: context.stopPropagation,
+      origin: context.origin,
+      frameUrl: context.frameUrl,
+      visitedBusses: context.visitedBusses ? [...context.visitedBusses] : undefined,
+      commandId: context.commandId,
+      comms: context.comms ? {
+        forwardTo: context.comms.forwardTo,
+        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.
+
     if (context.visitedBusses?.includes(this.uuid)) {
       console.warn('this bus was already visited before. Doing nothing.');
       return;

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);
   }
 
 }