Changes in 20201129092505

Built from ba96687ff42f8c9841c1d0fb911bb91404ee5f94

..index..
Bug 1660336 R[Core:Audio/Video: Playback]Add VA-API decode path to bundled ffvpx
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 1662062 R[Core:Graphics: WebRender]Scalable vector graphics files gets distorted if zoomed in using pinch-to-zoom
Bug 1679606 R[Core:Networking: JAR]Enable telemetry collection for network.jar.channel event
Bug 1678310 R[Core:Security: CAPS]Expose siteOriginNoSuffix on nsIPrincipal
Bug 1677894 R[Firefox:about:logins]Intermittent browser/components/aboutlogins/tests/browser/browser_removeAllDialog.js | Title contents should match l10n-args attribute set on element - 1 == 2 - got 1, expected 2 (operator ==)
Bug 1588710 N[Firefox Build System:General]Enable Stack clash protection on supported OS / arch
Bug 1679631 R[Firefox Build System:Generated Documentation]Upgrade Markdown
Bug 1678969 R[WebExtensions:Request Handling]Replace MOZ_MUST_USE with [[nodiscard]] in StreamFilterParent
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Changes to 9 bugs - 6 fixed.