The only advantage of OneTab is that it converts tabs into links thus saving memory. Other than that it's slow and maddeningly clunky. First of all, the website must be open; a left click on it starts you on a 6-step process just to save it to OneTab. This would take seconds if a tab could just be dragged and dropped into a tab group but that's not how it works. And when you close the website it doesn't return to its place in the OneTab list. You have to go through the entire procedure again if you still want to save it. Secondly, organizing tabs is a many hour process with little instructional guidance especially if you already have many links in the OneTab list. There just isn't an easy way to do anything. As said, it saves memory and that's all.

I believe that you may have inquired all of my reviews in each one form!

唐突に保存してたタブが全部消えました。
まだ無事な方はすぐにエクスポートしてください。
All of my saved tabs suddenly disappeared.
If yours are still intact, export them immediately.

very useful for when you wanna shut the pc down but still save your tabs !
be aware tho to not save tabs for years tho , it's meant to be temporarily .

Works, even together with Tab Stash and Tab Containers. Just be careful about updating in macOS, I read that you might experience problems.

It finally happened... Multiple months worth of tabs instantly gone, the addon froze up and the extension menu for saving tabs wouldn't work, I close Firefox and then its completely empty. This extension hasn't been updated in a long time as well, I think it's time to find an alternative.