From Wiki:
When PKGBUILDs receive enough community interest and the support of a Package Maintainer, they are moved into the extra repository (maintained by the Package Maintainers) <…>
So, librewolf package has 150 votes and librewolf-bin has 429 votes. And it’s 6th most popular package in AUR (by “Popularity” metric). Why it still isn’t in official repos?
I understand why things like yay or google-chrome isn’t in official repos, but browsers like LibreWolf seems reasonable to include. Other browsers Brave, Zen, Ungoogled Chromium isn’t in official repos too, but Vivaldi is.
Because it’s a two-part ting. Being popular enough and finding a maintainer (from them limited pool of official maintainers there are) who does it.
The AUR is unofficial and no one cares much if updates are delayed there but the offcial repositiories have higher standards and -and that’s related to the list of browsers also not in the official repos- maintaining google-based browsers is a pain in the ass (in fact I’m used to seeing warnings because librewolf is once again flagged aus out-of-date but the AUR maintainer didn’t have the time to fix the latest build yet).