Changes in 20210314094531

Built from 20f79622ed40fe9e9a722a4ae416e794518088c6

..index..
Bug 1483259 N[Core:Audio/Video: Playback]Intermittent dom/media/test/test_playback.html | ambisonics.mp4 should not fire 'error' event NS_ERROR_DOM_MEDIA_DECODE_ERR (0x806e0004) - virtual mozilla::MediaResult mozilla::FFmpegAudioDecoder<55>::DoDecod
Bug 1663509 N[Core:DOM: Animation]Intermittent dom/animation/test/mozilla/test_restyles.html | <random failure>
Bug 1692963 N[Core:DOM: Core & HTML]Intermittent dom/base/test/browser_bug1691214.js | Test timed out -
Bug 1569314 R[Core:DOM: Core & HTML]Incorrect constraint validation for select element with selected disabled option
Bug 1688712 A[Core:DOM: Navigation]Intermittent docshell/test/navigation/test_bug1300461.html | check history index - got +0, expected 1
Bug 1697904 N[Core:JavaScript Engine]Migrate more JS prefs to StaticPrefs
Bug 1697935 R[Core:JavaScript Engine: JIT]Remove unused javascript.options.spectre.object_mitigations.barriers
Bug 1697890 R[Core:Layout][Fission] Unexpected blank/white space on the right side of iframes (next to scrollbar)
Bug 1698265 R[Core:Widget: Gtk]Fix non-native theme with very light gtk themes
Bug 1654354 N[DevTools:Debugger]Intermittent devtools/client/application/test/browser/browser_application_panel_telemetry-debug-worker.js | A promise chain failed to handle a rejection: Resource server0.conn0.content-process20/workerTarget5/source4 does not exist
Bug 1697426 R[Firefox:Address Bar][Proton] Address bar panel slightly disappears under the taskbar in some cases
Bug 674371 R[Firefox:General]Support double-tap to zoom in on a section on macOS
Bug 1696574 R[Firefox:Menus]Adjust "print selection" to come directly after "select all" before the separator with "search [search engine] for..."
Bug 1693677 R[Firefox:Site Permissions]Grant a temporary grace period for re-requesting microphone or camera devices after the track stops
Bug 1697623 R[Firefox:Theme]Improve proton compact density - round 2
Bug 1693066 R[Firefox:Theme]Update tab audio indicator to latest Proton spec
Bug 1698107 R[Firefox:Theme]Consolidate accessibility and private browsing icons
Bug 1698249 R[Firefox:Theme]Move theme variables from browser/base/content/browser.css to browser/themes/shared/browser.inc.css
Bug 1698237 R[Toolkit:Themes]Extension icon lost color after bug 1697806
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Changes to 19 bugs - 13 fixed.