I see the described behavior with all Firefox versions on Windows XP.
I do not consider this a bug. Flash has dominated focus for far too long. When I stop looking at the flash object, I am looking somewhere else: my focus has changed.
I do consider this a bug. If you started looking somewhere else and then came back to it, your focus has returned. That's the bug. Perfect example in the test page that I linked above. There is documentation that's further down the page and they have to scroll to see it all. When they're done reading, they return to the top to try it out. From a user's standpoint, if you click on something that's a link, it should work. They have no idea that they have to "give flash the focus" and then click again. That would make absolutely no sense at all. All I'm asking for is that the user experience is consistent. After all, that's what a browser is for, the end-user, yes?
Allow flash no keys until flash itself modified that adobe flash control features page allows individual users to specify which keys SHALL NOT be used by flash object. This rather than trying to use the browser, in which flash is a 'guest', to make flash objects behave. Without the 'user consent in adobe flash setting panel' no keys work. Flash object in page prompts user to make this setting or flash object (game) receives no use of keys. It is obscene that I have to use the new tab toolbar button in firefox rather than hotkeys.