[vladvasiliu]

I don't have my machine on hand to give you the specific extension, but basically it's something called "notabs" or similar. Whenever a new tab is opened, it gets moved to a separate window. It works mostly OK, but it can sometimes get confused.

I combine this with some custom chrome to completely hide the tab bar area at all times.

Afterwards, I manage my firefox windows with i3 as I would any other window. They usually end up in tiled mode.

[mo_42]

Thanks, I guess it would be the following extension:

https://addons.mozilla.org/de/firefox/addon/adsum-notabs/

For the custom chrome, I'm using in userChrome.css:

  #TabsToolbar { visibility: collapse !important; }

[vladvasiliu]

That's the one, yes.