I‘ve verified this issue using Firefox Beta 100.0b7 (Build ID: 20220417185951) on Windows 10 x64, macOS 11.6, and Ubuntu 20.04. - The Firefox browser is set as default when clicking the “Make Firefox my default” button from the “Thank you” spotlight modal /“about:welcome” screen after the browser update.
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I‘ve verified this issue using Firefox Beta 100.0b7 (Build ID: 20220417185951) on Windows 10 x64. - The Firefox browser is set as default when clicking the “Make Firefox my default” button from the “Thank you” spotlight modal /“about:welcome” screen after the browser update.