I'm on Arch, running latest Firefox from pacman. Recently after kernel updates browser renders all open tabs with greyish color which is the same when it asks to "do one small thing". Interesting that navigation over website works, it just like Firefox put a 100% width and height grey div on top of the site. Also none of the toolbar buttons works. Usually I got away with one-two system reboots and browser would finally prompt to do the thing and work normally since then. But today it won't do a damn thing after like 10 reboots.