this project should be the template of all future tree tab extensions! It's so simple and barebones but does most of the work. It's not as bloated as sidebery but can still fit your needs.

This exactly what I was looking for. Simple and no useless stuff. Nice addon.

Btw, Can you add an option to increase the font size and another keybinding Ctrl + E (unused) for toggling the tab bar?

Please help, is there a way to modify the sidebar.css? what can I specify in my userChrome.css to change the --sidebar-bg-color and --tab-bg-color

Simple, minimalistic. Great if there was an option to adjust density and font size. Other than this, fantastic