[danShumway]

Interesting project! Off the top of my head I guess it would be a larger addition since this is currently using built-in Firefox features for isolation, but recording/caching requests that are made during the initial load in order to "freeze" a website until the user chooses to update would make this more useful.

If you do want to go down that route, using the blocking `webRequest` to record responses and stick them into storage and then re-serve them from the cache would possibly be the best way to go about it. At that point though I'd probably advise seeing if you could get off of `<all_urls>` as a required permission? And I haven't ever played with blocking network requests for websockets, so I'm not sure if they'd require separate handling.

Just a thought. But regardless, thanks for sharing :)