Tab grouping is the latest big-ticket feature addition to get added to Mozilla Firefox, which sees a new stable release roll out from today. Last month's
I’m on Linux as well, so that’s probably not it. But I just checked the release notes, and it does say:
This feature is part of a progressive roll out.
What is a progressive roll out?
Certain new Firefox features are released gradually. This means some users will see the feature before everyone does. This approach helps to get early feedback to catch bugs and improve behavior quickly, meaning more Firefox users overall have a better experience.
I’m on Linux as well, so that’s probably not it. But I just checked the release notes, and it does say:
So hopefully you’ll get it soon!