

No, there are ‘workspaces’ -accessed via the buttons on the bottom of the vertical tab bar-with their own tabs, but you can’t group tabs within one workspace (yet). And yes I can open the sidebar -which is not a popup- on the other side. The thing that’s popping up on the left next to the tabs and overlays the site is what Zen calls the web panel.
I’ve donated in November after I switched back to Firefox as my main browser. I read about the search deal dependency and wanted to contribute to what Mozilla called “reclaim the internet”. Feel something akin to ‘buyer’s remorse’ when I now read how little goes to development of Firefox/Gecko (the only multi-platform alternative engine for rendering the internet) and how much goes into CEO salaries.