Firefox and desktop without mouse!

I use WMII. Its great. Now I use my mouse just for copy-paste. I use firefox keyboard-only, with numberedlinks extension.
The problem is:
In firefox, how to remove focus from a flash object? I cant remove focus with Tab or Shift+Tab :(
any ideas?
tia

I'm not sure, but I would just install the flashblock Firefox extension. Then flash objects will only be displayed when you want them to.