Updates for Thunderbird 140

Individual change lists are no longer published for each release.

Modern WebExtensions are generally stable and do not require ongoing updates to remain compatible. For Experiment add-ons, the number of potential changes in Thunderbird’s core code has grown so large that tracking and documenting every incompatibility is not an effective use of resources.

It has proven more effective to discuss compatibility issues during the weekly add-on developer call or on the add-on developer mailing list. These forums allow developers to raise questions, share experiences, and collaborate on solutions with the community.