Rated 5 out of 5 stars

by bennyd on Sept. 13, 2011 ·

Today suddenly FireFox 6.0.2 on Mac OSX 10.6.8 had become the same problem...
Because I managed to solve it on a WinXP PC I tried my luck in OSX and it worked. :-)
In OSX you can find the needed file in:
\User (your name) \Library\Application support\FireFox\Profiles\RANDOM CODE HERE.default\Extentions\{582195F5-92E7-40a0-A127-DB71295901D7}.xpi

Further the solution is the same for Win and OSX.

Rated 5 out of 5 stars

by bennyd on Sept. 12, 2011 ·

First of all Divrsit deserves all the credit!

At home I'm using Firefox 4.x on MAC OSX Snow Leopard without any problems...the add-on never stopped working.

At work I used to using the same Firefox version on Windows XP Pro but with the problem that the add-on was asking to login....without success.

I updated the WinXP FireFox to version 6.0.2 but the problem still exist...?

After reading the feedback here I tried the fix that is described by Xander and it worked for 100%.(https://addons.mozilla.org/nl/firefox/addon/gmail-manager/reviews/310882/)So to all....give it a shot...

I found the file under C:\Documents and Settings\MyUsername\Application Data\Mozilla\Firefox\Profiles\mtrp3we6.default\extensionsFirst I made a copy of {582195F5-92E7-40a0-A127-DB71295901D7}.xpi.....you never know....;-)Then I renamed the xpi extension to zip to open it easily with Winzip.

Next I extracted the contents to a temporary folder on my desktop.Located the necessary file (see explanation of Xander) and replaced what they described.

After that I made a new zip with the reworked contents of the temporary folder and respected the internal dir structure so the file looks the same as the original zip.

Last I renamed the new zip back to xpi and replaced this file with the original in the above mentioned folder.Start Firefox....watch....and smile....Success!