After I upgraded to Ubuntu 22.04, Firefox doesn't activate menus or cursor shapes on mouseover and I need to perform a click for Firefox to respond to these events.
After upgrade I was unable to update Firefox and finally I had to do a complete removal en re-install, but after reinstalling, the problem persists.
(I reinstalled Firefox from the Software center).
Other related errors: for example, when I select text on a page, the text isn't highlighted until I release the mouse, so it's quite uncomfortable as you don't know for sure which text is selected.