This is a to-be-released new MONTHLY version, that has already updated to 132. It may show warnings, but it is SAFE. If you're comfortable with it, stay with it. The monthly rollout is coming soon, the intent being to share the newest features on the monthly version. We are in a transition phase, has having two releases is a first.

Thank you for taking the time to answer David.

Let me try to prevent an x-y problem/situation and be more direct.

If I wanted to only track releases from thunderbird that are not in testing, not in beta, not in alpha, etc. Say "Safe" or "ESR" releases, what filters or data should I be trying to track when using resources like

This page - All releases and this page - Stability Releases

I initially thought the stability releases json was our golden ticket but I see the 131.0.1 which is throwing me off. My objective here is to prevent any releases at all that are marked as testing, I get that later 131.0.1 may become a stable release or however you want to word it. But as of today, if I go to that release notes page the fact that it says "Testing" is a problem.

Can you help me find a more robust way to track which releases are safe/esr (Non-testing in any variety) where transition releases/versions wouldn't "incorrectly"(from others point of view, I personally understand why you mark it as such) pop up from time to time?

I respect your concern, but this is a one-time scenario. Thunderbird is on the cusp of releasing a second release, a first in 20 years. Once done, I believe prior listings will be validated. I am not on the 'in crowd' on this, being a volunteer, but I suggest you wait until the monthly is formally released to pursue your objective.

Again, thank you for insight, that is good to know.

As you can see on https://www.thunderbird.net/thunderbird/releases/ the Thunderbird Releases since 17.0 have been released in a ESR fashion even though they have not been referred to as ESR until Thunderbird 115.10.2esr.

The Thunderbird devs plans to have rapid Release again (much like with Firefox) along side the ESR and also the Beta and Daily development test channel builds.

https://support.mozilla.org/en-US/kb/thunderbird-128-nebula-faq#w_why-is-thunderbird-128-labeled-as-128-0esr-when-previous-versions-were-not-called-esr

Actually the current test Release is Thunderbird 132.0 as you can see at https://www.thunderbird.net/download/

Thunderbird is on the cusp of releasing a second release, a first in 20 years.

In twelve years actually as the Thunderbird Releases have been done in ESR fashion since Tb 17.0 released on November 20, 2012