We we able to reproduce bug 1853896 and bug 1850544 respectively but unfortunately we could not narrow down a regression range yet due to the fact that both bugs are intermittent. Tested and reproduced on Windows 10, macOS 12 and macOS 14 on Youtube, but not on Amazon Prime. We could reproduce up until a Nightly 60.0a1 build(2018-02-02), which indicates at least that this is not a recent regression. Steps to reproduce: 1. Launch Firefox. 2. Open a youtube video in a new tab. 3. Quickly enter fullscreen(F) or via fullscreen icon.
Bug 1853896 Comment 11 Edit History
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We were able to reproduce bug 1853896 and bug 1850544 respectively but unfortunately we could not narrow down a regression range yet due to the fact that both bugs are intermittent. Tested and reproduced on Windows 10, macOS 12 and macOS 14 on Youtube, but not on Amazon Prime. We could reproduce up until a Nightly 60.0a1 build(2018-02-02), which indicates at least that this is not a recent regression. Steps to reproduce: 1. Launch Firefox. 2. Open a youtube video in a new tab. 3. Quickly enter fullscreen(F) or via fullscreen icon.