Thunderbird Beta
Test new features and fixes in the most stable pre-release build of Thunderbird.
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Test new features and fixes in the most stable pre-release build of Thunderbird.
Do you enjoy testing new products? Then you might be interested in our foxfooding program.
Test future versions of Firefox before they are released to the public by downloading Firefox Beta, or Nightly.
Table of Contents 1 Step 1 - Preparing performance recording in Thunderbird 2 Step 2 - Recording a performance profile 3 Step 3 - Saving and sharing a performance profile 3.1 Old versions of Thunderbird 4 Profiling Thunderbird startup and shutdown Step 1 - Preparing performance recording in Thunderbird The performance recorder is part of the Developer Toolbox in Thunderbird. Before you start your recording, prepare as much as possible the scenario which you want to test in Thunderbird. In Thunderbird’s main window, open the Developer Toolbox: Press Ctrl + Shift + ICommand + Shift + I, or click on ≡ > Tools > Developer Tools.
You can download the Beta and Nightly versions of Firefox Focus for Android to your mobile device. Once you've downloaded the apps and begin testing, you can report any issues you encounter. Table of Contents 1 Download Firefox Focus for Android Beta 2 Download Firefox Focus for Android Nightly Download Firefox Focus for Android Beta Download Firefox Focus Beta to experience new functionality and bug fixes prior to these being released to production.
Discover and test experimental features with Firefox Labs, accessible directly from your Firefox settings.
Disable automatic updates through the DisableAppUpdate policy, and get Firefox beta builds to test features in your environment before deployment.
Firefox Focus runs studies to make sure users are getting the best experience when they test new features.