Must have!
Although, options propose:
1) ability to remove it's appearance from context menu, tab menu, addressbar
2) option to stash to last used group
3) option to stash tab and leave it open

EDIT:
2) Sorry, I don't have GitHub account at the moment. What I meant is - ability to stash current tab in the stash group I last used/stashed tabs into, (thus not creating new group every time). There is no difference between 'Stash this tab' and 'Stash this tab to a new group', at least not in FF v89, Kubuntu 21.04.
3) You are right, my bad.
---Anyway, thank you kindly for your reply and for all your work. Kudos!

very interesting exytension and useful ! keep up the good work

Very neat! Thank you. Well constructed app and has all the functions accessible in an intuitive manner.

as a procrastinator, I used to pin tabs and they would soon get messy and bulky, now I don't.

I never think I needed this, until working on my master degree, it's quite crazy tbh... yeah...

After losing a bunch of tabs to onetab, I was looking for a better extension. Tab stash is it!! This is a really great extension.

The best thing since sliced bread.

Really, though: this extension is a breath of fresh air when it comes to organizing your bookmarks. The UI takes a week or so to get the hang of, but after that you have to wonder why this isn't more common to have those game-changer buttons like "open everything and delete this group" in bookmark UIs. The "restore from delete" function means rectifying mistakes are ten second detours. Having your bookmarks in the form of an easy to pull up, easy to hide sidebar is great, and being able to choose a full sized tab when you need it is even better.

I've been using this extension for around a year without issue, and got the rest of my family on it the other month. All smooth sailing, and a big thank you to the dev for continuing to improve this critically useful extension.

Like some others who have rated this add-on, I've been looking for a OneTab replacement. Tab Stash seems very promising in this regard because it offers much greater flexibility. When I first started using Tab Stash, all of the available options seemed confusing, but after using it for a while, I am now impressed.
One suggestion I might have for improvement, however, is to add the ability to select am existing "stash group" when clicking on the toolbar icon or the icon in the address bar, so tabs can be stashed directly instead of moving the tabs into a new group requiring me to move them later. I realize I can accomplish this from the sidebar, but it would be easier to do it my way.
It would also be nice to have an option on the options page to leave a tab alone after stashing it, rather than hiding or closing it.
Third, I'd prefer to have an option to not save deleted stash items at all (i.e., not even for one day).
Finally, being able to rename stashed items (not just groups) directly would be nice too instead of having to do it through bookmarks.
Still ... excellent work!

Perfect for keeping research & projects organized & easily accessible across devices!

Best Tab management tool available. At times when I am researching for an article, I can have 50 plus tabs open which will chew up memory but with Tab Stash, I can stash them into different groups, shift between groups & instantly reduce tabs open thus less memory used. The developer also improves it constantly. Brilliant