Comment 13 for bug 1059051

Same behavior for me :
Ubuntu : 12.10 - uptodate
Firefox : 16.0.1 - uptodate
It's not a fresh install but an upgrade 12.04 -> 12.10 (no problem otherwise reported)
The "do you want to add gmail... ?" in Firefox appears almost every time I log into gmail
Each time has a "yes" answered, but nothing happens then.
=> Within firefox, Preferences>Desktop Integration shows a checked "prompt for integration..."
and the Exceptions list is just empty
unity-webapps-gmail is v2.4.7

hope this helps...