I love that it hides but (by default) doesn't automatically unload/close a tab that you stash (it stays loaded in the background) because it allows you to switch back to the hidden tab without having to reload the page (so e.g. you don't lose your place in a video your watching). You can customize this behavior in the options menu or change it so that stashed tabs are automatically unloaded/closed. It might automatically unload running hidden background tabs under certain conditions but this behavior can be disabled in the options.
There's no picture of it, but the "Tab Stash" submenu in the (right-click) context menu has the items:
Show Stashed Tabs in a Tab
Show Stashed Tabs in Sidebar
Stash Tabs
Stash This Tab
Stash This Tab to a New Group
Copy Tabs to Stash
Copy This Tab to Stash
Options

Firefox's sidebar (that I previously hardly ever used) makes using this addon extremely convenient because I don't have to open/switch to an intermediate "tab management/list webpage" (i.e. a webpage that lists all tabs & tab groups, like OneTab's "Display OneTab" page).
[EDIT/UPDATE: Turns out you can using the sidebar] You can stash multiple selected tabs at once but I'm not sure if it's possible to stash them directly/immediately into a preexisting named tab group of your choice like you can do with OneTab (I think that stashed tabs either automatically go to the top-most group or it creates a new unnamed tab group - it seems to only create new unnamed tab groups for me but that may be because I've been fiddling with the options).
It would also be nice if there was a menu item like "Close this tab and remove it from all tab groups" so that I don't have to manually find and remove a tab (from the tab groups) once I'm 100% completely done with it.
Overall, I think this is superior to OneTab, which was my previous tab manager (I hear that Mozilla is working on finally giving Firefox its own tab manager so we'll see if tab manager addons become unnecessary).

ý tưởng thật là tuyệt, tôi đang gặp vấn đề về kho luu trữ của mình, cảm ơn về ý tưởng của bạn

It's what I needed for so long! All the features I actually liked from SimpleTabGroups but as a sidebar and PERFORMANT!
Grouping stuff is super comfortable. And the search with unlimited results is great.

really useful and fantastic extension, as a bonus: had issues and the dev immediately pointed me to a solution.

Thanks for the great utility.
I have ADHD and often have information overload, this tool has helped me a lot in staying organized.

PS.
If you can integrate feature to manage tags in lists/groups or items, the utility will be even better.
Thank you so much.

What a relief this extension exists. I love you guys for this. No more cluttered desktop with a bunch of windows open, just freedom!

I haven't seen this mentioned before but I'm actually using this for all of my bookmarks. It just makes organising them so much easier. 18 Groups and 901 tabs... wonder if there's a limit? Seems to be working well so far.

Awesome addon. Although Multi-Account Containers support would make it perfect

Very useful if you use to browse with many many tabs open. Like one does :)

Container support (storing and restoring to the same container) would make this extension perfect!

I am migrating from the "new" edge chromium thing. One of the few things I liked about it was collections as a nice way to organize ideas. I think combined with pocket this can replicate that for me and more

After giving up on the competition, I returned to the Mozilla universe. In doing so, I found that FF was no longer the problem child it had once been. It's now speedy and fun once more. Only thing missing was decent tab manager. Enter Tab Stash. This is one of the sleekest, simplest and reliable extensions I've encountered. Josh, you've done what Mozilla could not - gave FF a good, reliable tab manager - I LOVE IT! Ya did a great job and made a lot of users happy. Only thing I'd change at this point is to add an opportunity to click on a stashed tab, have it open and remain in the stash.Thanx!!!

GREAT. it's literally what i wanted. I would just put further away the "open and close everything " button from the "open every tab" button, so that it would be less probable to missclick. THANK YOU

Now I have AVG and Fire fox for my security