Comment 9 for bug 237604

I am wondering if this has nothing to do with Gnome, but it is actually a bug purely in Firefox, and thus belongs there. The reason I think this is so is because I just experienced the exact same thing in Windows XP after an hour of surfing with Firefox! It happened at about the same time I opened a PDF (after having opened many pdfs in the same session without troble).

How this bug is able to reproduce itself on two different platforms, having an effect on key presses even after closing Firefox, is beyond me.