Thunderbird Release Channels

Thunderbird provides releases through four distinct channels, each serving a unique purpose. Below are the channels, their corresponding branches, and a summary of their purpose:

• Thunderbird Daily (comm-central): Where development and testing begin, and new features are developed.
• Thunderbird Beta (comm-beta): The monthly stabilization release.
• Thunderbird Release (comm-release): The official monthly release.
• Thunderbird ESR (comm-esr): The official annual extended support release.

These four channels offer increasing levels of stability, increasing as code moves from Daily to Beta and being the highest in Release and ESR.