Review for Gmail Manager by above
Rated 4 out of 5 stars
Funny, it did not improved in the new version! Here is the solution (problem with logging): http://forum.blogowicz.info/topics93/firefox-602-i-gmail-manager-0641-nie-loguje-vt4728.htm
When you are finished working. It turns out that the error is prosaic! I guess one does not develop this add-on!
To create your own collections, you must have a Mozilla Add-ons account.