Earlier quoted context omitted.
> but this addon promises to restore it Mozilla did the same with tab groups, then the addon was abandoned. The replacement that is compatible with the new form of extension isn't able to unload the tabs, just hide them, which undoes most of the performance benefits. [abraham simpson voice] It'll happen to you too! [/abraham simpson voice] /jk
The addon was abandoned by its author because Mozilla was making major changes to the addon API at the time. Extensions used to have carte blanche to change the browser, which was a security risk, not to mention it made threading/parallelizing the browser hard. The new extension API removed a lot of that freedom. After the API change, it wasn't possible (and might still not be) to develop a useful tab groups addon wi…
I don't buy that. It's my browser running on my computer, it's my choice whose code I choose to run on it.
If, say, emacs or vi had this kind of handholding, neither one would be much more than a text editor.