This add-on works great. The only issue is one that isn't the fault of the add-on. I use a 4k 49" monitor, so I have plenty of real-estate. The popup size is limited to 800x600, which is a limitation of Firefox, not the add-on. Markus was very helpful in explaining this to me and suggesting a workaround. He said "You can open the tab manager in its' own tab however ( right click -> "Open in own tab" ). That would give you the fullscreen capacity that we're seeking..". I find it easiest to open a Firefox window just for Tab Manager Plus. Thank you for porting this great add-on to Firefox!

Wow, this is incredible. I've been avoiding firefox quantum tab management addons as they've always been pretty poor compared to the ones I used to use in firefox back in the day. But I'm glad I tried this, it's incredibly visual.

Superb Extension, 5 stars is not enough for this. Keep up the good work for the mass people. Thanks.

Since I discovered this extension it became an indispensable tool for me and I am glad that the developer agreed to port it to Firefox- I have tested about a dozen tab managers and I find Tab Manager Plus the handiest and the most customizable one. Tab Manager Plus is open source and developer responds usually quickly to bug reports and feature requests.