I would be worried about this if the plan was for it to only support MacOS on mainline Firefox. This is Nightly, two release cycles ahead of regular Firefox, an

I would be worried about this if the plan was for it to only support MacOS on mainline Firefox. This is Nightly, two release cycles ahead of regular Firefox, and support will be coming to other platforms: "porting it to other POSIX systems (Linux, Android) will be easier than Windows, due to the overlap with macOS" (https://developer.mozilla.org/en-US/docs/Mozilla/Projects/WebReplayRoadmap https://developer.mozilla.org/en-US/docs/Mozilla/Projects/We...)