Works, but it always opens a new tab, so you have to start recording in the new tab and then switch to the one you want to record. If you can't or don't have time to edit the video, you are stuck with that bit at the start.
Would be really great if you could crop to a specific section of your screen, rather than just having to record the whole thing.

Works great. Just can't figure out how to record sound or how to unmute a recorded video.

Really Great Extension but need some improvements.