I would like that tabs and tab groups and MDI and related stuff like that, would be a feature of the window manager rather than the browser. (The application program (e.g. browser) may need to tell the window manager which window the new one is created from, but I would design the operating system to do that.) This way it can be used with many programs and can be used consistently with different programs and does not require add-ons; it also allows to do e.g. split-screen, to use MDI instead of (or in addition to) tabs if the user wants to do, etc.

> Oh wow it was Tab Panorama and I faintly feel like I used it... Damn

That's right!

I didn't think people would hate my original comments so much. That's weird... Why so? Do people disagree that tab groups are useful? Maybe if you barely ever use internet that's true. People are weird...

Edit: nevermind, that makes sense, my comment is under the wrong posting, this about a port, not FF development, downvoted excepted :) But still, Firefox is pretty much the only relatively mainstream browser that does not have tab groups. That's... ridiculous.