Comment 5 for bug 243856

Just to make sure, I have just tried it, and yes, it happens when the cursor is in the middle of the flash box. And if you click outside of the box, you will be able to invoke the Firefox shortcuts (obiously), which is not the case with the lock-up I reported.

By the way, I forgot to tell to use the non-automatic weapons to reproduce the problem (so the mouse is not pressed continuously), and you may have to shoot around a bit before it happens. Not much, though.