a Torproject repo - which I haven’t checked yet but may be a more direct way to obtain newer TBB releases.
That’s apparently just the “normal” https://deb.torproject.org/torproject.org/ with its “usual” contents. I.e. no Tor Browser as Debian package.
As far as I understand, extrepo doesn’t invent its own software. It’s not a kind of flathub. extrepo is a tool to make adding repositories such as https://deb.torproject.org/torproject.org/, https://download.docker.com/linux/debian, https://dl.winehq.org/wine-builds/debian, etc. easier. Kinda a way to upload an APT signing key to Debian and /etc/apt/sources.list.d drop-in configuration snippet by sending a pull request to the extrepo-data repository.
sudo apt install extrepo
Reading package lists… Done
Building dependency tree… Done
Reading state information… Done
The following additional packages will be installed:
The following NEW packages will be installed:
0 upgraded, 2 newly installed, 0 to remove and 4 not upgraded.
Need to get 635 kB of archives.
After this operation, 2,060 kB of additional disk space will be used.
Do you want to continue? [Y/n]