If only Firefox still worked. Every time I open Firefox on Linux, it does disk I/O for about two minutes before it is usable. No idea why. On current Ubuntu, about once a day, Firefox stops accepting keyboard input. Sometimes right in the middle of a text box. Other windows still accept input. Restarting Firefox is usually necessary.
I have no idea either
But I do not think it is Firefox. I open it regularly on three computers, Ubuntu, mint, and Debian 12 and I don't see that