How to ungrab Firefox hotkeys from Flash players

How to ungrab Firefox hotkeys from Flash players: "This article presents tools and code to allow a Firefox running on Linux® to respond to hotkeys, such as Ctrl+t (open new tab) even when an embedded Flash player has the focus. Use the code here to reclaim your Firefox keyboard application control. This article does not fix the underlying problem, but it provides a work-around to Mozilla bug No. 78414 for Linux users."