1. If any application (including browser addons) does not have an OFFLINE import-export-backup function, it has no value to me, does not follow good practices and is poorly designed.

2. Cloud sync may be OPTIONAL for users who clearly need it.
Full import-export (containing complete data to restore the previous state, folders, groups, stars, pins, tasks, etc.) locally to the file is the foundation.
Cloud here, cloud there, some clouds everywhere, but a large group of users do not use clouds for everything (many use self-hosted) and must have access to file backup.

3. Currently, it is not possible to return to v1 as a workaround -> v2 should not be released because it is incomplete.

4. Do not install v2 if you plan to reinstall the OS soon, because you will lose the ability to export your OneTab bookmarks!
I was going to install a new OS in the coming days and now I can't transfer my bookmarks.

Maybe need to look for another addon?

PS: The current look and new features are great, but the lack of FULL file export-import is a bummer...

Newest update wiped years of accumulated tabs. The developer has taken no responsibility. Changed the way they save tabs, don't test it, and wipe user's existing tabs without making a backup first?

DO NOT TRUST these developers.

Closed multiple windows without warning immediately after installing. DO NOT INSTALL.

Lost all stored tabs over one update.
Become worst than useless overnight.

Down from five star because without warning, this stupid developer destroyed YEARS of accumulated saved tabs. The updated version DID NOT EVEN WORK it tried to show something but could only give me the start of a menu with flashing dots at the left as if it was doing something. Thank God there are other options for this functionality because I'm never going to trust this developer with my data ever again AND YOU SHOULDN'T TRUST THEM EITHER.

Lost all my tabs with the last update.

New update deleted ALL my tabs, with no warning. Insanity. How could you forget to write a migration script that imports the HTML to the new format!?

went from a 5-star extension to a 1-star (I'd give it minus 5 if I could) simple cause of the sh***y update that center-alligned everything without an option to revert it back to left allignment

STOP MESSING WITH HOW I WANT THINGS TO LOOK AND FEEL!!!
The new "ui update" is horrid, wastes so much "screen estate", and suffers from the same typical garbage "fluffy rounded cloudy corners and seperating things with 5 billion wasted pixel-space between each section" -.-

Exported tabs, uninstalled, reverted back to old version and disabled updates...

I love it on Windows, but on Android I have over 100 tabs open and it only offers to save one tab. Which makes it kind of useless.

do NOT use this extension. I have a 32core Threadripper with 128G RAM and it still crashed trying to restore 960 tabs. Thankfully I already made a backup. Task Manager never showed FF using more than 32G of RAM, so it is the extension and not Windows running out of memory

I'm writing this on my phone while I wait for the extension to restore all the tabs in my PC (so that I can delete the extension).

I expected it to be bad but I decided to give it a try since it was a recommended extension. I certainly didn't expect it to hog all my RAM and make my system unusable

I eventually got it to collect all open tabs into one but it did not allow to restore them again. Cleared all, restarted pc and the same thing. Seems it does not work that well

why does this extension constantly duplicate itself? without fail it will show up as two of itself running in the task bar, one of them will work and one will not. It can only be fixed by uninstalling the addon. This has happened easily 6+ times, this is reoccurring and repeatable.

Why do all the links I've saved always disappear suddenly and randomly?

Hi, after enabling this extension, Firefox stops opening pages or loads them very slowly after some time. Restarting the browser temporarily fixes it. I experienced this issue on my Mac, and after Firefox Sync installed the same extension on my Windows laptop, the exact same problem started happening there as well. Please fix

10/10/25 Mozilla can't handle the heat from all the incompetent add on "developers" so they are now trying to censor users by requiring and email address to login. One tab is a classic example of a Mozilla "recommended" add-on that is just no damn good.

Can't deal with long tab lists and
reduces your system to a crawl by eating up memory to produce the list. One example of many mozilla add-ons that need to be sold to someone who actually knows what they are doing. Slow to load very slow to import export which has to be done manually. Another junk Mozilla "Recommended" add-on
Now let's see if Mozilla deletes this review or my account.
Mozilla going the way of GMAIL. God help us.

The extension consumes all RAM and makes PC unusable. With 100 tabs on the list (closed) and 2 open tabs it eats all 8GB and all disk swap. Giving the fact the goal of extension is to save RAM, this makes no-sense.

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.