**[Affected versions]:** - Firefox Beta 100.0b3 (Build ID: 20220407185832) **[Affected Platforms]:** - Windows 10, 1803 version 17134.285 **[Prerequisites]:** - Have a Firefox Nightly/Beta 99 browser installed. - Have a new Firefox profile. - Don’t have the Firefox browser set as default. **[Steps to reproduce]:** 1. Open the Firefox browser with the profile from prerequisites. 2. Update the browser to the latest version. 3. Click the “Make Firefox my default” button from the “Thank you” spotlight. 4. Observe what happens. **[Expected result]:** - The Firefox browser is set as default. **[Actual result]:** - The OS settings window is opened and the Firefox browser is not set as default. **[Notes]:** - This issue is not reproducible for new users. - I didn't manage to investigate this issue on Nightly, but I'll come back with additional details on Monday. - Attached is a screen recording of the issue.
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**[Notes]:** - This issue is only reproducible only after a browser update. - This issue is also reproducible if the browser is set as default from the "about:preferences" page or from the "Make default browser" prompt. **[Affected versions]:** - Firefox Beta 100.0b4 (Build ID: 20220410195727) - Firefox Nightly 101.0a1 (Build ID: 20220410213958) **[Affected Platforms]:** - Windows 10 x64 **[Prerequisites]:** - Have a Firefox Nightly/Beta 99 browser installed. - Have a new Firefox profile. - Don’t have the Firefox browser set as default. **[Steps to reproduce]:** 1. Open the Firefox browser with the profile from prerequisites. 2. Update the browser to the latest version. 3. Click the “Make Firefox my default” button from the “Thank you” spotlight. 4. Observe what happens. **[Expected result]:** - The Firefox browser is set as default. **[Actual result]:** - The OS settings window is opened and the Firefox browser is not set as default. **[Additional Notes]:** - This issue is not reproducible for new users. - I didn't manage to investigate this issue on Nightly, but I'll come back with additional details on Monday. - Attached is a screen recording of the issue.