This is the closest thing I can find as a replacement for Tabli (Chrome Extension) on Firefox. Job well done.

Great potential extension!!! But do you really think that icon is enough to recognize the needed tab??? So, please, add some views with tab captions, urls (most likely, cut). Also, don't you think that Close window button should be placed in upper right corner as a standard? BTW, very nice look! UPDATE: It appeared I'm wrong and there's a mode which shows the tab names!!! SUPER ADDON for sure!

https://github.com/stefanXO/Tab-Manager-Plus/issues/148 seeks a user guide.

I love that I can get a birds eye view of my various windows, and delete or move tabs without having to actually open or visit them. I wish the group label and color were visible when I go back to live browser-life, but not sure if that's possible. Also, the labels/colors don't seem to stick, not sure why.. deleted cookies?

With my 1K open tabs (of which all I need of course) this is the best manager I've yet come across. The deletion of duplicate tabs is a life-saver! If the developer ever opens up a Patreon account I'll sure as hell will give him/her my money since again, this piece of software saves my life. Btw, dark-mode is also supported by default!

One tab at a time does what I need. Deserves a 5 star
the extension is really useful for focusing on one problem at a time. Instead of having too many tabs.
This extension is a must have. i thank it should have a different name though.

This addon is great for people like me who routinely end up with way too many tabs open. I keep it open on the sidebar, and it has really helped me find the tabs i'm looking for. I like to use the search bar at the bottom, it will highlight the tabs your looking for. It also shows the tabs that are open in other firefox windows, which is something else i really like. Thanks to whoever made this.

Great extension, very useful. Feature request: sync my settings across my browsers on different devices when I sign in to Firefox & automatically toggle dark/light mode based on system theme

Tab Manager Plus 5.2.0 is a Special Operations tool for "multi-tabbers" like me. The "Limit Tab Per Window" feature is well worth the $25 I tried to donate. Great job, Markus!

I love this Addon. I ve been using it on other Browsers and Today i have discovered that its included on Firefox as well! I like the feature of automatic scrolling and showing in the list where is the tab is open at the moment! Excellent job guys!

>>> REQUEST: PLEASE ADD FUNCTIONALITY INTO TAB AND SIDEBAR (RATHER THAN JUST MENU). <<< THANK YOU! :D :D :D :B :B :B

Easiest and most useful interface of all the tab managers I have tried.