Thunderbird Beta

Beta is a testing and development channel. Users of beta get fixes and feature changes before they are made available in regular releases, and users can assist by reporting bugs, helping other beta users, and giving feedback. We love having users try the beta versions.

However, because of frequent changes, the beta channel is considered to be unstable and not recommended for production. Also, add-ons may not work or may unexpectedly break. If you require add-ons you should consider using the normal release, rather than the beta versions.


Betas serve multiple purposes:

  • From a user point-of-view, using a beta version and providing feedback is an easy opportunity to be involved in improving your favorite open-source software, requiring little or no techincal skill. And because beta gets fixes before release, you might get relief from a problem that is not yet fixed in a normal release.
  • From a developer and release management point of view, beta is a test bed for patches and features which have landed in daily build channel but needs more users and more testing.
  • Overall stablility and quality is monitored, so that regressions are found and fixes verified before the code moves to a release version.
  • Add-ons authors use the beta channel to develop, update, and fix their add-ons.

While beta is considered to be unstable, quality and stability are goals for beta and are normally sufficiently high for adventurous users to use it on a daily basis. And you giving feedback helps make that possible.

Installation and updates

You can download the beta from the channel page. When you run the beta, updates are pulled from the "beta channel" so that you get beta updates, not normal release updates. Updates occur every 4 weeks, and as needed by developers and Thunderbird release management.

You can also run the normal release of Thunderbird "at the same time" by installing the beta into a different directory than the release version. (And when the normal release is running, its updates come from the "release channel", not the beta channel.)

Give Feedback

User feedback and investigation is essential to the improvement of Thunderbird. You are encouraged to :


Add-ons frequently may not work in the beta environment, especially after beta version 60. If you require many add-ons you should consider using the normal release.

That said, if you have issues with an add-on please:


A channel is a mechanism for managaing the update process. When you download and install Thunderbird it is set for a specific channel, and that installation receives updates only for that channel according to the configuration setting in the program directory.

Thunderbird has three channels

  • Release - the most stable channel, with major new versions roughly every 10 months, and minor versions every 4 weeks
  • Beta - pre-release channel described above
  • Daily - is a highly unstable testing and development channel, the initial location where developers land patches for new features and fixes. You can get daily at channel download.

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