I ditched Tree Style Tabs for Tab Groups on Firefox. Unfortunately, the Simple Tab Groups extension isn't quite what I want. I wanted a tab group to appear as a tab. Instead I have to click into a dropdown menu to select which tab group I want to switch the window to.
If anyone knows of a good Tab Groups extension for Firefox which represents tab groups as a single tab which expands when you click on it, that'd be fantastic. Then if you click on a tab other than one in the group (or tap the group tab again) it all collapses into the group tab.
I can certainly get used to this but I'd like if it were a bit more concise...