Firefox tab groups have genuinely improved the way I work with my browser, as someone who usually has ~100 tabs open across a dozen windows at any given point in time (about half related to history research)

https://blog.mozilla.org/en/firefox/tab-groups-community/

You asked, we built it: Firefox tab groups are here  | The Mozilla Blog

What happens when 4,500 people ask for the same feature? At Firefox, we build it. Tab groups have long been the most requested idea on Mozilla Connect –

@anirvan how about profiles? I haven't quite gotten into those yet..
@maphouse Yes! I can’t live without profiles. It’s so nice to have different logins to the same site for different roles