This plugin is fantastic and I really really like it!

There's one change I'd like to see changed, I completely agree with the name of your plugin and it works super well in a lot of contexts, but it's a bit problematic in the Tree Style tab itself.

You see, the name is so long, that It pretty much always gets clipped as you can see here in this screenshot.
https://i.imgur.com/UI9kX37.png

I would argue that the name "Tabs" is more than enough and a tad cleaner.

Офигенная штука.. Самая лучшая замена старой версии старого фаерфокса

I love this addon, but it suddenly stopped working when I updated to Firefox 65. Xubuntu 19.04

Wonderful add-on that I've been using for years. By far one of my favorites!

I have just a small request for a next release:

- Could you add the ability to modify the scrollbar color in the CSS code? My eyes begin to become a bit old and a mid-grey on a light grey as currently becomes not enough even with the largest width, so an option to give any color to this scrollbar would be wonderful. I currently can't see this option within the snippets.

Possible?
:-)

Cheers!