Desde la última actualización, funciona mal constantemente. A cada rato debo entrar a complementos para desactivar y volver a activar la extensión porque desaparece de la barra.

solution to update prob ...
https://www.ghacks.net/2020/09/22/how-to-fix-onetab-not-working-in-firefox/

Randomly OneTab was not visible in the toolbar. All my links were gone! It's a great tool but not very reliable..

Worked great. In the last month stopped working. Today lost all my tabs I had been curating. I will never use another tab manager that doesn't allow me to sign in to restore tabs in case of problems.

great add-on, ... until I lost all my tabs

I know it is probably not a fault of OT devs, but as you may have noticed, it breaks over time.

OneTab is essential. However, as of Sep. 2020, it has a new bug: it disappears after the browser is launched, and you have to disable and re-enable to make it work. They need to fix this. Also, the developer could make it so much better, for example by allowing more ways to manage and display the tab list.

Broken OneTab? Add-ons Manager -> OneTab -> Toggling "Run in Private Windows" every time Firefox starts-up seems to re-enable the OneTab extension.

My biggest gripe with OneTab is the insistence of utilizing: "https://www.google.com/s2/favicons?domain=" rather than other options or even no favicon. Yes, I would prefer an option to not even waste resources on the favicons.

Suddenly broke. I'm not reinstalling to risk losing my tabs again - I'll find something more reliable.

This add-on is a brilliant idea. It's quick and easy to save tabs out of the way until you want to go back to site. Can even organise tabs into groups and rename them too. This is great when researching different subjects. I've been enjoying the useful functionality of OneTab for ages now. A really useful way of bookmarking.

Until the last update (16 September 2020). It is now completely broken. When it's fixed I'll come back and update the rating.

Brilliant!! Problem quickly sorted out. All data restored too!!
I guess we expect things to go wrong sometimes but the way the problems are dealt with is very important. So many businesses today don't seem to care, but the developers here have acted quickly to resolve the issue and get us up and running again. It even looks as though they have taken the trouble to reply to every single person who has raised the issue, not just posted a response for people to find! I even had an e-mail from them. That is true "customer service".

So in conclusion, definitely five stars, both for the add-on itself and the developer's support!!

Right now this add-on is unstable or bugged. The icon disappeared from Firefox and I couldn't use it, so I had to reinstall it to work again. Which resulted in losing all my previous tabs!
I hope this issue gets fixed soon.

It broke on the recent Sept 2020 update, but following a suggestion to turn it off and on again under about:addons page actually fixed it. I've been using this for a few years and continue to love it despite this.

Used to be great but now every time I open Firefox I have to go an manage my extensions turn it off then turn it on again. I don't know if this is the team's issue or a firefox issue, all I know is it is very irksome and I would like to hope it gets resolved

To those who also want to give 1 star review: addon now requires turning it off and on to start working again for some reason. Unforseen update of Firefox?

The add-on simply stopped working few days ago. No instructions whatsoever on how to recover tabs on a Linux machine of course... In short: all the tabs lost!

EDIT: Changed from 1 star to 5 stars
The add-on is working again, and all the old data reappeared. I guess problems happen, the important thing is that they are solved promptly, and this is the case!

This is one of my all time favourite addons, so it was with horror and dismay, after it having worked without a hitch since the day I installed it, I awoke one day to a totally blank OneTab page staring back at me with terse and cold indifference. The "OMFG, no, no, no, no, NO, this can't be happening!!" factor was real!!

But! Having regularly taken advantage of the backup option, I was somewhat hopeful I could fix things and lose only a couple of days worth of new tabs. Unfortunately though, no amount of disabling/re-enabling or uninstalling/re-installing could bring back the last tabbed days of my online life. Then, having nothing to lose, I decided to revert to an older version as suggested by a user further down the comment line:

https://addons.mozilla.org/firefox/downloads/file/3359470/onetab-1.29-an+fx.xpi

Oh blessed be!! It's back! It's all back! I could hardly believe it! Whew! Cheers of joy, high fiving myself (and the cat) and a couple of woop woops broke the tense and mournful atmosphere and I was back in business, baby! :) (Shout out to Keegan Witt for the link to the old version. Thank you, my friend! Thank you!)

So... Despite the heart attack-inducing shock of potentially having lost all that was dear to me (tab-wise anyway) I am giving this addon 4 stars. When it works, it works like a dream, so I won't punish the team who made this otherwise brilliant addon by giving a lower score, because do you know what? Sometimes, shit happens. Yup, sometimes it just happens, even to the best of us. The fatal errors in the new version are most certainly not done intentionally and I feel a great deal of compassion and empathy for the poor developer/s who are maybe having a minor heart attack of their own, sleepless nights and they're probably (hopefully) working feverishly in a panicked sweat to fix whatever went wrong and get things back on track. I just can't bring myself to jump on any "cancel culture" bandwagon and diss or abandon this addon after all it has done for me, and besides, I am hopeful there'll be fix soon.

So, to keep this review short, (Yikes! Too late!) I still request a donate button somewhere on the OneTab page and I will be thankful and grateful and happy for having this FREE addon available to me. When it works, it's a little piece of heaven.

So as I said, 4 stars it is, and now I'll be off. I have some more tab-hoarding to do....

Rant over.

Edit (a couple of days later): I'm upgrading my rating to five stars. Turns out all the blame for the temporary malfunctioning of the addon lies with Mozilla and not the OneTab addon. Installed the latest fix and everything's back in perfect working order.