yes

Tabs gone after Firefox close.
It happened right after all groups just deleted itself and all 100+ tabs were on main view.
BUT
I just noticed that this extension is making backups every day by default. Due to this, I was able to restore all of the lost tabs.

So am changing rating from 1/5 to 5/5.

That's literally what I need from such extension. Keep up the good work!

Works as it says, but it keeps downloading files automatically into folders similarly named "STG-backups-FF-137.0.1".
Why does it do this? How do I make it stop?

Please continue working on it. This add-on is much more convenient than the Chrome-inspired, brand-new built-in tab groups feature.

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

Add-on suddenly stopped working, which was quite a disappointment.

Legit kept hiding my taps and I couldn't make groups show on the tab list

Please add an option to change the backup location

Works absolutely as expected, extremely useful to me, very happy with that extension.
Only one complaint: I want better control over the folder where backups are created! Because my Downloads folder is clogged with tens of STG folders of different versions...

Keeps loosing my tabs when I close firefox.

Become one of my favorite extensions!

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

Simple and effective. Has a few integration shortcomings to my feeling, but nothing in the way of it being great.