I've been using this for a while. I have TONS of tabs saved in it. All of a sudden it doesn't work. When the tab that lists all my tabs could be seen, it was BLANK. All my tabs were gone. Right clicking on the icon in my FF's menu bar doesn't allow me to do anything. I can manage the extension only by uninstalling it. I can't reinstall it in hopes of it working and finding my stored tabs wherever it stores my tabs. On FF's page for this I can only uninstall it. I left a message for the authors of this extension but they didn't reply. It's ONE purpose is to save and not lose tabs. It lost ALL my tabs. I must have had over a thousand.

タブが復元されるのに時間がかかり、一部のタブは「新しいタブ」となり、正常に復元されない。

I loose all the links every time mozilla firefox updates and restarts. This is a serious bug which onetab team not fixed.

Lost my 83 tabs when I clicked "restore all".

Closes the tabs and stores the URLs. Breaks sites like Pandora.com

Despues de un un reinicio del ordenador por fallo del suministro electrico se ha perdido todas las pestañas guardadas en OneTab, no hay ningún backup no forma de recuperarlas.
Mucha información perdida

I love this extension until I lost all my saved tabs suddenly…
shit extend！

You not support Firefox Multi-Account Containers ?
I restore the tabs but the containers dont work i see ? ((((

no syn function. Be careful you will lose you bookmark one day.

One Tab needs a Dark mode option..

Who designed it so that all tabs disappear when the user clicks on the icon?
Why is it that when I freeze while restoring tabs, there are no tabs in Firefox and OneTab?

You will lose all of your saved tabs sooner or later. make backups regularly. Firefox/Chrome...doesn't matter. This extension seems great but it will break your heart and make your life a nightmare. After the first time, I gave them a pass and now I am screwed. Just because it hasn't happened yet doesn't mean it won't happen. Check out what they have to say about this app in Reddit. F**k me.

destroys all open tabs and the side bar add-on I had in use; worst extension I ever activated

[Update]: This app was good but keeps going down hill. After 5+ years, enough is enough. UNINSTALLED. The backup/export buttons have now been removed preventing any kind of tab integrity.

[Old Review]: Lost all my tabs, no idea why. This kind of unreliability is a problem. I have had it happen before, but it it is very irritating.

Tenía como 500 pestañas y me las borró casi todas.

Well after reading many reviews, which I strongly urge YOU to do before touching this, I went against my better judgement and thought Id install it and just give it a test run whilst making sure to back up anything I relied on OneTab to handle for me. So I am one of those guys who has anything from 101 tabs to 550 tabs open pretty much all of the time! Yes I know it seems dumb, hogs memory, slows firefox down, drains the system RAM over time...etc, etc, etc but thats what I do because I am a bit scatty and I so often am not finished with reading or going down that particular thought train and really want to continue with it at some point. And so I leave another tab open, planning to revisit. I do admit that my current tab count of 514 is a bit over stupid and I will be culling that number after I submit this review.
So what was my experience? It was not great I can tell you. It resembled what I had read about in manymreviews. In a nutshell: OneTab saved hundreds of tabs as advertised and then when restoring....well, it just didnt! it was as if I had asked it to restore a selection of random links out of the list of over 300 it had made. As if I'd asked it to randomly pick ANY of the links and restore them but only restore less than 50 , one time it reached towards 100 so I was becoming happier hehe. But not happy.
This is DANGEROUS and should come with a warning to expect data loss!!
As I said, I took precautions. I simply created (...or 'saved' I think I should call it, a ne??(w session which is just using the session manager to give me a back up of all of the tabs that were open before I did anything drastic like trust an addon to do what it promised and handle some tab urls and restore them when asked to. Luckily, session manager works great...so does firefox sync, which was my secondary backup I suppose cos I had just sync'd my open tabs and sent them to other firefox open on my other PC and my laptop!
Well dear reader, if there still are any at this point, I want to leave you with some predictable advice so, here goes..l
Please Dont Bother With This!
I dont think it is ready for Prime time. Not quite yet. Too unpredictable for now and too risky for your data to be handled by and trusted with.
If you must have a go then be smart: Do some backup like my method.
DON'T LOSE DATA


*longest review I ever did write

Suddenly all my tabs are gone and OneTab shows nothing but a blank page. Have tried reaching out to Devs but they dont respond

Installed this with the hopes of managing the many tabs I have opened.

OneTab took all my tabs, converted it into a list that allowed me to easily review and delete the ones I no longer need.

However, when I tried to restore the clean list of tabs from OneTab back into FireFox, it only restored 5 tabs out of 84.

Buggy and cannot be relied upon if you want to cleanup your tabs. I have since deleted/uninstalled this extension.

When it works its great when things go wrong - things go very wrong.

Firefox crashed lost all links pushed to one tab. Requested assistance multiple time and never got a response.

This is the third time this has happened. I can no longer trust the plugin with saving data.

I hit the OneTab icon accidentally and sent dozens of tabs moved into OneTab. So I hit the Restore All option but only 5 tabs restored.... The rest just vanished.