Earlier quoted context omitted.
looks like he's able to port everything important: https://github.com/piroor/treestyletab/issues/1224#issuecomm... just hiding the normal tab-bar might require a line of userchrome.css
I wrote a couple of styles to hide the tab bar and the sidebar header: - Tab bar: https://github.com/Timvde/UserChrome-Tweaks/pull/31 - Sidebar header: https://github.com/Timvde/UserChrome-Tweaks/pull/32
I even managed to move the address bar in to the title bar, but unrelated to my CSS, the browser toolbox now refuses to open...
