Changes in 20201005093214

Built from 5380e007a12cb5081a14736d7e00885c57f42129

..index..
Bug 1667533 R[Core:Audio/Video: Recording]Perma [android] TEST-UNEXPECTED-TIMEOUT | /mediacapture-record/MediaRecorder-peerconnection.https.html | TestRunner hit external timeout (this may indicate a hang When Gecko 83 merges to Beta on 2020-10-19
Bug 1668577 R[Core:DOM: Navigation]Make child process to send offset to parent process, not index
Bug 1662839 A[Core:Layout]Move AuthorStyleDisabled/HintCharset/HintCharsetSource to WindowContext or BrowsingContext
Bug 1668421 R[Core:MFBT]fallible example code in comment is incorrect
Bug 1668966 R[Core:Panning and Zooming]only clear PresShell::mResolutionUpdated after the apz transaction
Bug 1667612 R[Core:Panning and Zooming]factor waitToClearOutAnyPotentialScrolls out from various tests and put it in apz_test_utils.js
Bug 1667116 R[Core:Widget: Gtk]Screen tearing in full screen
Bug 1668430 R[Firefox:Address Bar]Add test about search mode and one-off button behavior when typing search engine alias after selecting one of one-off button.
Bug 1668052 R[Firefox:Session Restore]Pass the BrowserParent's browsing context to UpdateSessionStore instead of getting it from the frame element's frameloader.
Bug 1662319 R[Firefox:Sync]Remove the sync engine "repairers"
Bug 1667841 R[Firefox Build System:Toolchains]Update revert-r362047-and-r362065.patch for clang-12
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Changes to 11 bugs - 10 fixed.