Changes in 20210214094209

Built from fb5a1a49ca4a4681b91a545ce49bbb7ca15bbe8c

..index..
Bug 1673637 R[Core:CSS Parsing and Computation]Intermittent css-valuesandunits/unit-vh-vw-overflow-auto.html == css-valuesandunits/unit-vh-vw-overflow-auto-ref.html | image comparison, max difference: 1, number of differing pixels: 29
Bug 1692617 R[Core:Canvas: WebGL]Rendering into a miplevel while sampling from a disjoint set of miplevels should be allowed for immutable textures
Bug 1692064 R[Core:Internationalization: Localization]Add Histogram Telemetry on main UI localization times
Bug 1691612 A[Core:JavaScript Engine]Add public APIs for CompilationStencil
Bug 1692644 R[Core:JavaScript Engine]Add memory reporting to Stencil data structures
Bug 1688828 R[Core:JavaScript Engine: JIT]Optimize TypedArray length with double result
Bug 1689270 R[Core:Layout: Text and Fonts]Remove or update probes expiring in Firefox 88: BASE_FONT_FAMILIES_PER_PAGE
Bug 1691659 R[Core:SVG]Svg texpath disappears in firefox when you change pointer events
Bug 1692661 R[Core:Widget: Cocoa]deprecated NSSystemDefined enum constant in MediaHardwareKeysEventSourceMac.mm
Bug 1692663 R[Core:Widget: Cocoa]LSCopyKindStringForMIMEType is deprecated in nsOSHelperAppService.mm
Bug 1691274 R[Firefox:General]Rewrite `X.setAttribute("hidden", Y)` to `X.hidden = Y` in browser/
Bug 1682076 R[Remote Protocol:Agent]Intermittent Page.click should click offscreen buttons (click.spec.ts) | expected PASS
Bug 1691814 R[Remote Protocol:CDP: Runtime]Improve message for "Got valid timestamp" failures
Bug 1692540 R[Toolkit:Crash Reporting]Simplify string code in GetObjCExceptionInfo
Bug 1681842 R[Toolkit:Crash Reporting]Parent process crashes on arm32 aren't detected, zombie app stays behind
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Changes to 15 bugs - 14 fixed.