OK, I've fixed it for the new Gmail interface.
It's pretty tricky, and very little is left of the FireGPG code. I've used Gmail's Greasemonkey API:
http://code.google.com/p/gmail-greasemo … onkey10API
and the greasemonkey compiler:
http://arantius.com/misc/greasemonkey/script-compiler
Then I've manually tweaked a few things, etc...
You can see the result here:
http://gauret.free.fr/fichiers/firefortune/
I don't know if it will be useful to adapt FireGPG to the new Gmail code, but it's better than nothing I guess...