It is restoring tabs, one by one, so when I had 5600 tabs, it was trying to restore (open) a 5600 tabs one by one.
Browser of course crashed, so I was not able to open my tabs.
It is not possible to make "auto groups" based on domain or regular expression.

DANGER. The app slows down the system a lot. And if you use groups for tabs, it deletes them!

ОПАСНО. Приложение сильно тормозит систему. А если вы используете группы для вкладок, то она их удаляет!

탭 복원을 하면 파폭의 탭그룹을 다 날려 버립니다.. 날아간 탭그룹은 복원할 방법도 없습니다. 와 내 탭들...

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.

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.

lost all my tabs...like years of tabs...and I just now realized there is no save file...just fucking url save files that you yourself have make in txt file format....yeeears of tabs and no way to get them back

onetab is a ticking time bomb bro, sooner or later you will lose all your tabs for absolutely no reason. gg.

Right when i installed MY BROWSER LITERALLY FROZE when i TRIED TO REMOVE IT NOTHING HAPPENED my browser was SO LAGGY THAT NOTHING WORKED ANY MORE

Three red flags of malware:
Does things without permission ✅
while doing this it takes a lot of power ✅
it is difficult to remove ✅

Please explain to me why theese flags of malware are all true for this extension
Mozilla Firefox (136.0.4) Windows 11

Can't open 600 tabs

I used to love this, but I found out that once you share your tabs, those get indexed in Google, be careful.

I am absolutely done with this add-on. It works great, until it doesn't. For the fourth or fifth time now, over the course of the last year or two, I click on one-tab only to discover that all the tabs I have been saving for the past few months--all the organization and labeling--they're all gone. As if I'm starting from scratch again. I'm so frustrated. There has to be a program with this convenience that doesn't screw me over entirely in the end.

I added this extension to move my tabs from Chrome to Firefox. I shared the tabs from a Chrome window in a webpage. I do not see a way to "Restore" the tab list to a window in Firefox without opening each of them individually.

Tried this on a fresh profile. Very stupid behaviors:
- Click the OneTab button, it will close all tabs, thus the name OneTab. But I usually just want to stash one or several tabs, not all. To achieve this, I must right click. Very annoying.
- When you open a session, it will load all the tabs at the same time. NO! They should be in dicarded state, and load on demand.

So my conclusion is, I will not use this addon.

For those who have lost tabs, I discovered that selecting Exit from the hamburger menu instead of X (close) avoided loss of tabs. Also, if X is clicked by mistake, I found that restarting my laptop (or possibly just closing Firefox and reopening it, I'm not sure) restored the tabs I had open.

When first opening Firefox, a succession of several sessions, one with only 1 tab and others with a group of tabs, rapidly appear before displaying just one session with the right group of tabs. I'm now going to disable this add-on and stick with Firefox's "open previous windows and tabs" option.

Edit: The behaviour above (2nd paragraph) still happens even after disabling the add-on, both with X (close) and Exit. AND this edit paragraph is missing (despite definitely clicking Update review) if closing with X!!