Hi,
I spent a few days wondering why some keydown events were not processed properly by my Javascript code to finally find out that the bug was caused by the Flash Player add-on.
In my case, I was working on a Facebook application, and some of the ads use the player, which is why it was interfering.
If any of you has ever been utterly frustrated at similar popular companies for making crap and getting away with it, please at least take the time to vote for my bug report: https://bugs.adobe.com/jira/browse/FP-5693
I hope they get this fixed ASAP so I can start advertising my app.