Seamlessly sorted a thousand of open tabs.
However, I agree with other commenters that sorting by domain and dark theme support would've been nice. Otherwise, a nice extension that does exactly what it's said to do.

Firefox did seem to crash but I suspect it was the amount of tabs I sorted at once. Works exactly as documented otherwise. Thanks!

ピン留めしていないすべてのタブをソート対象にしている。
私の希望する動作は選択しているタブだけソートすることです

In every Firefox version I have ever used, ctrl-shift-o opens up the Bookmarks Manager. After installing this add-on, when I type ctrl-shift-o all I get is the Bookmarks Manager. No sorting of any kind is done to the tabs. Additionally, none of my PC keyboards has ever had a "command" key that I remember. I did try using the Windows key--but that didn't work either. If you're using this add-on with a PC and Firefox and it works for you, please tell me how you are getting it to work.

Works well for me. Only wish I could sort the tabs by domain instead of just url.

Sorts Tabs Alphabetically, works perfect for me

Works well, no issues. Useful for clearing down tab-overload after a heavy session. An idea for an enhancement (would earn 5 stars) - provide the option to sort by just the last two parts of the domainname - so that eg. docs.nginx.com, www.nginx.com and nginx.org would all be placed together.

Works as intended, under-rated. -_-

Is it working, especially for new tabs opened?

ctrl-shift-o opens my bookmarks manager (Library window).

Firefox 57.0 Linux-64bit

A future proof web-extension providing a toolbar button to sort tabs by site.

When I have lots of tabs open, it tends to turn into a mess, so this is great for cleaning it up.

Does nothing at all. Can't use when there is no menu entry. Useless!

Can you add option to auto remove tabs with duplicate URLs?

Would like the menu item but.. Great job!!