Changes in 20210104090857

Built from 3cba4d895b8e8d11fc2b36b4c15cc1d80af73543

..index..
Bug 1681043 N[Core:Audio/Video: Playback]mozilla::PDMFactory::Supported blocks the main thread when creating the first content process during startup
Bug 1351248 R[Core:DOM: UI Events & Focus Handling]Can't tab into or out of fieldset with overflow auto
Bug 1684706 R[Core:GFX: Color Management]Some small cleanups.
Bug 1684723 R[Core:GFX: Color Management]Make transform functions take a & instead of *const.
Bug 1684760 R[Core:GFX: Color Management]Misc qcms cleanups
Bug 1684797 R[Core:GFX: Color Management]Don't enable qcms c_bindings feature by default.
Bug 1684638 R[Core:Graphics]WebGLShaderValidator.cpp: do not use 'else' after 'return'
Bug 1684726 R[Core:Layout: Text and Fonts]Intermittent text-transform/all-upper.html == text-transform/all-upper-ref.html | image comparison, max difference: 255, number of differing pixels: 17192
Bug 1684719 R[Firefox:General]Remove unintentionally added .orig files
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Changes to 9 bugs - 8 fixed.