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Re:A Classic Extension Reborn: Tree Style Tab by semi-extrinsic on Thursday December 07, 2017 @05:03PM (#15874792)
You can hide the annoying/superfluous parts of the GUI pretty well with userchrome.css settings.

The worst part now is the "no extensions on special pages" and "no extension may open an about:* page".

Re:A Classic Extension Reborn: Tree Style Tab by pvdebbe on Friday December 08, 2017 @03:57AM (#15877556)
In the light of recent advancements on Firefox I feel optimistic these issues get addressed within the next 12 months.