Rated 3 out of 5 stars
Bug: serious conflict with Favicon Picker 3 - addon won't work
I've tested various scenarios to find the intruder which causes the problems. My result is that Favicon Picker 3 prevents the functionality of Group/Sort Tabs.
I doesn't work no longer - none of the features ;-)
Hope you can fix it in the future. Both add-ons are essential for me. TabGroups Manager included.
Thanks for the great work! Cheers for beers! ,-)