Originally Posted by PTrenholme
I don't think it's a FF problem. Check your mouse pad (or just the mouse settings) settings: You probably have "sticky keys" turned on.
Nice guess, but no, I don't. And of course, I have considered the possibility that it is my mouse hardware, but two considerations weigh against it:
1) I have no problem like this in Windoze (this is a dual boot machine)
2) I have no problem like this in any other F11 program: only FFox.
BTW: I thought this problem went away with a recent update (I already don't remember which), but now I see it coming back, but more rarely: some recent update turned down the mouse repeat rate and so now I see it less often. Yet it seems to be becoming more frequent, though not yet as frequent as during the first week of running F11 on this machine.
This is why I am interested in hearing if others have had comparable experiences. So far I have only one such response.