Very good extension, but it have a very big bug:
When you delete an group, all tabs from all groups are remove.

very ugly user interface, barely usable

Its nothing Simple. The using give no effects. I'am nowhere see groups.

Not clear how to use. needs better instructions

it would a good extension if my tabs didn't keep disappearing.

Very difficult & unintuitive to use. I've had tabs mysteriously disappear or become hidden (with no bulk way to revert) by simply clicking through different group management options.

There is significant risk to losing work or losing tabs, I've found.

I'm now in the process of carefully un-doing my groups so as to not lose my tabs :(

Нет... До групп вкладок как в Chrome очень далеко... Не понравилось то, что вновь открытая вкладка сразу дополняется в текущую активную группу! Полнейшая ерунда! В настройках не нашёл как это изменить. Так же плохо то, что вкладки не сворачиваются в группу как в Chrome.

The Sidebery is the best!

Not simple at all and is buggy as hell. I keep losing tabs, the add-on keeps deleting or hiding all tabs when opening groups, or just closes Firefox totally resulting in the loss of all opened tabs. Many desired features are missing. How can this be the top-rated Group add-on is beyond me.

I have used this extension for years and it was too good, but currently it loses all saved tabs on every Firefox restart and won't let me get them since the last backup, it became unusable.
(Arch Linux, Firefox 132.0)

I like the concept of this add-on, although there are many moving parts; But, they are still flawed.

Last time I tried it, it left multiple bookmarks in my bookmarks folders, so this time I didn't enable any of the bookmarking features.

Without bookmarking it appeared to lose my open, organized, and appropriately containerized tabs on a few occasions. I'm ultimately opting to uninstall it again.

I've been using this addon for years. It's been great, but recently the feature to close tabs when switching groups to save RAM was removed from the settings. This feature was perhaps my favorite feature of this addon - if it were brought back, I'd give it five stars.

Used to love this. I have autobackup set up after a round a long time ago of it losing all my tabs. I don't save every single backup for space. My oldest is currently from last June. I've been saving tabs for projects, work, etc and when I tried to save one today it simply wouldn't respond. The majority of my tabs are gone and the groups empty. I'm not sure when it happened; even my oldest backup only has a couple of additional tabs to add. A lot of the newer things I added aren't there. I've lost tons of stuff. With backups, it never occurred to me I needed to check to make sure things were still there to even be backed up; my bad, I guess, for not going through every folder making sure every single thing is still where it's supposed to be at least weekly. Everything is simply erased.

Why does it need permission to "access your data for all websites"? A tab organizer shouldn't need access to my passwords I am typing to a website.

When it works it's awesome, one of the most useful extensions. But when it doesn't work, it just destroys everything. I had over 200 tabs across 15 or so groups. I opened firefox today and all the tabs are gone. The groups are there but they are empty... and this isn't the first time this has happened. So if you want to organize your tabs you can use it, but at some point it's just going to break and you will waste a lot of time opening tabs again.

Hotkeys only work half of the time making them unreliable and useless

Extremely confusing to use.

it groups tabs well and can be convinient but when i restarted my computer, all the tabs from my 4 groups were just gone. I even had them "backed up" since that was a defaulted option in their settings.

And then it keeps trying to hide tabs if you turn it off and back on. i feel like this is just another weird extenstion that just want to spy instead of making things more efficient. very annoying.

The extension doesn't support pinned tabs, which is what I was hoping to use it for. I have a lot of different groups of pages that I use for different projects, and pinned tabs are common in my workflow.

I was hoping I would be able to create different group of pinned tab (e.g. a group for work tabs, a group for personal tabs and a group for x other project), but I can't.

Another small nitpick is that all of the icons are near black, which makes them hard to read over dark mode theme.

Not so simple after all. I would love to see grouping like Chrome has it. I can see all my groups in one place (the tab bar). I can read name each group and open each group whenever I want. Super simple.