I have custom css to hide the tab bar from the top.

I also shrink it down when the mouse isn't over it. See the screenshots for mouse out and mouse over look.

Mouse not over tree tabs: https://i.imgur.com/ikQhxTM.png Mouse over tree tabs: https://i.imgur.com/TyRds6V.png

Works well for me.

Could you please post your userChrome.css that you use to achieve this? Looks very neat to me, but I don't know how to configure it.

I edited userStyles.css to remove the browser tabs from the top of the browser so that only the tst tabs are visible, plus in the tst preferences I added some css to highlight certain tabs such as email and slack. I also added some styles for suspended tabs and removed the a scrollbars.

Also a TST user. It take some getting used to, I don't think I'll ever go back to using horizontal tabs. It is very much functional out-of-the box and it comes with a lot of preferences to choose from. However for a cleaner interface you'll have to customize your UserChrome.css.

This is what I'm using right now - https://pastebin.com/bKHM8hp9

I change the theme and the opening tree behavior do it doesn't nest endlessly. I think I also put to open new tabs at the front of the children, so it is immediately preceding the parent. Just use it for a bit, the top tab bar is so silly.