I like this addon, but the lack of a user guide is frustrating. I only learned how to use it by reading the author's response to reviews here

Main thing I want from a tab manager is for it to auto-save sessions so they can be restored when Firefox inevitably fails to reload them after a restart. This does not appear to do that. It appears to do nothing but facilitate navigating between tabs, & suspending some tabs that are not currently needed. It seems to do those things OK, but they just aren't nearly as important to me as the baseline functionality of saving a list of open tabs to be restored on restart.

It keeps opening the what is new page on github and it is always the same content. Last update on 13.8.22? why display it if nothing has changed since then? make it stop

Nice and simple with some interesting features, only.. not confident enough to use it when there's no info re saving/restoring sessions - and nowhere I can find to ask questions about this??

Unable to drag tab from one window to another window.

It cannot do that much. There are better extensions for the same functionality and more.

That could be an advantage if you're looking for a minimalstic tool.

I like what this add-on can do but it is EXTREMELY laggy and unresponsive. I even turned off tab previews and tab details which helped a bit but it's still extremely laggy. I'm running on a MacBook Pro 2019 model with an 8 core CPU, and when I open this extension's popup window, it nearly pegs an entire core. I'm usually around 5-6% average usage on my CPU cores during normal browsing, but when I open the popup it shoots up to 15-25% average. You do the math. To be fair, I have 8 windows open across 2 Spaces, but each window has less than 12 tabs, and honestly if you're using a manager extension like this you've probably got at least half as many windows and tabs as me. I hope the developer works on improving the performance of this extension. It's very nice and only hindered by the performance. I will still use it.

edit: thank you developer for the response. I look forward to any and all performance improvements!

A pop up size is too small and inconvenient with my 600 tabs. Just consider simple task of moving 5 tabs from Window 7 to Window 13.
The app makes it impossible to handle.