"Customize Theme" does not work. Every next choice switches the previous one to default. Need fix.

EDIT
That was fast! Now it works. Thanks.

Works exactly as it's supposed to, fantastic.

The only things I'd criticise are that the dark mode is completely black(I'd prefer a dark grey) and the currently selected tab could be highlighted better, but these are just minor details.

this is the best looking and most responsive feeling vertical tab addon in my opinion, thank you!

Simple and gets the job done, the closest you will find to the old IE styled tab groups.

current version used:
https://github.com/asamuzaK/sidebarTabs/tree/master/dest