I think you'd prefer floorp instead. It's firefox/gecko based (I believe that's your main concern?) but has many features inspired by vivaldi/opera, including workspaces, web panels, vertical tabs...
Firefox
A place to discuss the news and latest developments on the open-source browser Firefox
After spending a day with it, this is exactly what I want! Thanks for the recommendation
Workspaces in flooro are poorly implemented though I would still suggest flooro as well. With the sidebery extension you can get some very good organization done
I'm not familiar with Opera, but it seems like you might be looking for something like Tree Style Tab.
thanks! I've tried this but in the end its just a different way of displaying but i want groups to be contained differently as well
Firefox has a concept that is called containers, but it's less a visual separator and more of a logical isolation layer (with separate cookies, etc.). Maybe this could work for you? I believe you can make different containers have different tab colors, but I'm actually not sure about that.
having switched from opera gx to firefox, Panorama-tab-groups did the trick. Combined with https://github.com/Godiesc/firefox-gx and it's extra addons.
One improvement i discovered was that no matter the window the tabs are accessible. Opposed to opera where each groups' tabs were tied to it's window, and you couldnt open the tabs from one windows into the other by clicking on the tab group.
Thanks for the tip! I actually consider what you call an advantage a disadvantage and visa versa. I always have 2 opera windows open side to side (on i3) and like that they are not the same
Coincidentally i just now set up different profiles using this guide (srry windows based, i'm sure you can do similarly on other OS tho), so now i have both.
Makes two shortcuts that each point to their own profile and opens in their own instance with separate taskbar icons. Then you add panorama tab groups to it and there ya go ultimate tab potential : p