Comment 20 for bug 326609

The problem does not seem to be the flash plugins. I switched to Epiphany and the flash is working exactly as it should.

The few things I noticed in Firefox was that there are two flash plugings flash 10 r12 and 10 r22. If you disable 10 r12 Flash ceases to work, which I means it is using an outdated version of Flash for some reason. I could not find where this version of flash comes from to remove it to test this theory.

So if you want working fullscreen Flash for now, I suggest Epiphany.