Thunderbird 140.6.0 ESR is due next week, so the Thunderbird folks are building it. Surely, something went wrong again, as the picture shows. But that's not what we're there to talk about. We're here to talk about software quality.
Question: How make fixes are included in their version 140.6.0 ESR compared to the previous version 140.5.0 ESR? Answer: Zero, nothing at all. Despite 72% of users still using the ESR version as compared to 25% of users on the buggy "Release" version (source: Desktop ADI: 72% on 140esr, 25% on Release, 3% on other), the ESR version is largely neglected while they keep flogging the regression-ridden "Release" version, see here, here and here. Betterbird on the other hand is including about 80 fixes in Betterbird 140 which the Thunderbird folks could easily ship in their version, too. But they established this ridiculous "backport" policy, where only fixes for severe issues are backported, so all the annoying regressions are left unfixed, and this applies to their "Release" version, too.