How to install Google Gears on Iceweasel.
Everybody knows Iceweasel is actually Firefox 3, everyboby except Google. When you visit http://gears.google.com, an ugly message says “your browser is not supported”.
The solution is easy: trivial user agent cheating 
Remember activate the add-on and set the permissions to the gears web applications.
Comments
User Agent Switch
You can also use the "User Agent Switch" add-on for Iceweasel. Just create a new user agent in the add-on's Preferences, and it will work fine.
Nacho
Does it works with a 64 bit
Does it works with a 64 bit processor?