Is it possible to update it in [testing] at least? This version is not an “upgradeable” release, as stated by the upstream. Not considered “next version” in the upgrades sequence. The next version after 68.11 is 78.2, which is not released yet.
Hypothetically [testing] could provide that release, but what for? To produce bug reports that will need to be dismissed immediately, because people didn’t suspected the upgrade is expected to break their installations? What is the reason to install 78.0 or 78.1? Unless either: - You are interested in very early previews, in which case you probably should be on nightly anyway; - You are among the people affected by the CVEs present in 68.11? But if you have a reason, you can install the official Mozzila’s release. There even is a ready PKGBUILD posted by someone on AUR, so you do not need to write your own from scratch: https://aur.archlinux.org/packages/thunderbird-bin/ A side note: I am not simply dismissive. Initially I was considering that putting it in [testing] may be a good idea. But after some talking with people around I changed my opinion.