Not a very good tab manager.

1) Can't move more than one tab at a time to a group.
2) Can't move a group in the panorama so that I can move a tab to it without scrolling to the new group. I saw a screenshot showing a Sort Containers screen but I don't see any way to get to it.
3) When moving a tab and scrolling, scrolling will sometimes stop and I'll have to start all over with the tab.
4) After moving tab, the panorama scrolls all the way down to the bottom and then bounces up and down for 3 seconds when I try to scroll up to the top again. Very irritating when trying to sort many dozens of tabs.
5) After sorting my tabs, ALL tabs still appear in the top tab bar instead of only the tabs in the group. No way to simply click on a tab in the tab group. Instead, I have to click the Tabs and Groups button, then click Groups (it's not sticky), then find my tab, usually by scrolling down and then scrolling right.
6) No user manual that I can find for more info on how to use this extension.

Maybe good for people that have less than a dozen tabs open but I deal with up to 100 at a time so I need something that doesn't involve a lot of clicks and scrolling to go from one tab in one group to a different tab in a different group.

It is not chrome-like. I hope it didn't need popup or sidebar to open and close groups.

Version 11.5.0 . Installing this caused Firefox to use so much RAM that I needed to uninstall and could not test it further. I like the screenshot showing a full page view of tab groups.