Something I think is related is that after some time, I can’t click the x on a tab to close it, but I can do middle click (L & R at the same time) to close a tab. When this happens, I also can’t get into the address bar. Just started seeing this with the last update (currently on 139.0.1) snap version.

This looks very interesting. I looked at the “add-ons” page for Firefox and noticed under permissions it said “Access your data for all websites”. Why would it need to access all websites? Why not just when you access YouTube?

I use Kubuntu. I like the KDE desktop and I like a Debian based OS. If someone is going to make their software for Linux, it will almost certainly be available at least for Debian. If, say you want it for Arch, you need to wait for someone to put it in the AUR or build it yourself.