Mozilla Thunderbird Beta

Mozilla Thunderbird Beta is the beta-channel macOS desktop edition of Thunderbird. Thunderbird is described as an email, calendar, and contacts application. The Beta channel is intended for testing: it is expected to be more stable than Daily, but less stable than the Release and Extended Support Release channels.

• Use Thunderbird for email, with calendar and contacts capabilities described for the desktop application.
• This package installs the Beta channel, not Thunderbird Release, Extended Support Release, or Daily.
• Beta builds may not work with all add-ons.
• The Homebrew cask installs Thunderbird Beta.app in /Applications and targets macOS.

Install with Homebrew Cask:

brew install --cask thunderbird@beta

After installation, open Thunderbird Beta from Applications. Choose this channel if you want to test a beta build; the official download page recommends the Release version unless you want to test Beta and report bugs. The official page also advises regularly backing up important data when using Beta. No additional Homebrew options are listed for installation.

Sources: Thunderbird Beta download and channel information · Homebrew cask