Rated 3 out of 5 stars

This extension is working fine with Firefox 4.0. I use Stylish to make Firefox's toolbars and tabs all black and that makes the font on TGM's tabs invisible, but I finally figured out that I could change the font to white. So far I really like this addon. I tried the TooManyTabs extenion before this one and there is really no comparison. TGM does what I need it to do without all of the screwy functionality that TooManyTabs has. All-around great extension. I am starting to have some stability problems with Firefox. I had three Tabgroup Manager tabs open and Firefox was crashing constantly. Many times I would start Firefox only to have it crash before it finished loading my tabs. Seems fine now without any additional Tabgroup Manager tabs open. I'll have to test this addon on my new laptop with a fresh install of windows to see if I these problems persist. Firefox 4.0 seems to have some stability problems of it's own, so it's hard to know where to place the blame.

This review is for a previous version of the add-on (2011.3.22.01.1-signed).