Firefox will sometimes send multiple requests with the same http channel id. When a frame is loaded, the favicon is requested in the parent frame, but with the same channel id. This can cause the document request to report the wrong frame, causing the test 'should capture iframe navigation request' to fail. It fails consistently on my computer.
This patch adds the content policy type into the http channelId to better distinguish requests. Maybe there is something better we can do? It looks like we use channelId has request ids, so there might be more bugs with these favicon requests in playwright?
When httpChannel is intercepted by Service Worker:
- it gets an internal redirect to another channel with the same id;
- once serivce worker responds, the channel gets the data, but
does not get any onResponse notifications.
So, we update our ResponseBodyListener (the nsIRequestObserver implementation)
to the new request and force onResponse from there once data is available or
request finishes.
