Comment 10 for bug 243856

Confirmed. This problem is not restricted to any one flash game. Play any game that requires both a significant amount of clicking and keyboard usage, and you'll stumble on this problem quite quickly. Just try clicking (not click and hold) in the game, then try to use the keyboard to move or do something. Do this repeatedly, and you'll usually run into the problem within ten clicks. I've noticed that the faster you click, the more frequent this problem is.

8.10 Intrepid, Firefox 3, flash 10 plugin (downloaded from adobe.com).