Changes in 20201128092706

Built from 77486ce0e2bcf6f7b0beeef34dbadceb1cd4d3f6

..index..
Bug 1678813 R[Core:Audio/Video]High frequency dom/media/mediacontrol/tests/browser/browser_nosrc_and_error_media.js | Test timed out -
Bug 1678553 A[Core:DOM: UI Events & Focus Handling]Stop using `UINT32_MAX`, `INT32_MAX`, `LONG_MAX`, and `-1` if they mean "no composition" in IME handling
Bug 1679568 R[Core:GFX: Color Management]Cleanup iccread.rs a little
Bug 1679411 R[Core:GFX: Color Management]Make qcms_profile_sRGB() safer.
Bug 1679577 R[Core:Graphics]Disable Advanced Layers
Bug 1545313 R[Core:Graphics: Layers]browser.startup.blankWindow: Screen flashes when browser starts up (Direct3D 11/Win10+Win7)
Bug 1677696 R[Core:Graphics: WebRender][Win7] Minimize, Maximize and Close buttons are no longer visible if Firefox Alpenglow theme is used with Webrender
Bug 1679468 R[Core:Graphics: WebRender]Block AMD 8.56.1.15/16 from WebRender.
Bug 1678711 R[Core:Graphics: WebRender]Make running with --software without the "software" feature panic.
Bug 1669282 R[Core:Widget: Gtk][KDE] Navigating to localhost:port causes Firefox to ask to choose an application
Bug 1645528 A[Core:Widget: Gtk][wayland] Connect nsRefreshDrivers in content processes with a widget-local vsync source
Bug 1678613 R[DevTools:Console]Promise previewer not using property descriptors broke VariablesView
Bug 1650609 R[Firefox:File Handling]Save/Download stopped working in Offline Mode (with privacy.partition.network_state enabled)
Bug 1589103 R[Firefox:Tabbed Browser]Intermittent browser/base/content/test/tabs/browser_privilegedmozilla_process_pref.js | Test timed out | Found a tab after previous test timed out: https://example.org/
Bug 1667152 R[Firefox Build System:General]Add --requirements argument to `mach python`
Bug 1666345 R[Firefox Build System:General]Un-vendor psutil
Bug 1661624 R[Firefox Build System:General]Native Windows builds lack cpu/disk data in their build resource graphs
Bug 1666347 R[Firefox Build System:General]Misc cleanup after removal of psutil
Bug 1678451 R[Firefox Build System:Task Configuration]rebuild of docker image ubuntu1804-test causes frequent mochitest task hangs: Automation Error: mozprocess timed out after 1000 seconds running ...
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Changes to 19 bugs - 15 fixed.