Bug 1680310 R[Core:Audio/Video: Playback]Assertion failure: GetManagerThread() && GetManagerThread()->IsOnCurrentThread(), at src/dom/media/ipc/RemoteDecoderManagerChild.cpp:432
Bug 1678909 R[Core:Canvas: 2D]Drawing an ImageBitmap multiple times changes the image
Bug 1683220 R[Core:DOM: Core & HTML]Remove nsJSContext::MaybeRunNextCollectorSlice machinery
Bug 1668871 A[Core:DOM: Navigation][Fission] Intermittent docshell/test/browser/browser_platform_emulation.js and docshell/test/browser/browser_ua_emulation.js | Test timed out -
Bug 1682450 R[Core:DOM: Security]When multiple SameSite attributes are present Firefox should parse the final one
Bug 582459 R[Core:DOM: UI Events & Focus Handling]document.activeElement does not update after an onblur event within an IFRAME where the focus is set outside of the IFRAME
Bug 1683226 A[Core:DOM: UI Events & Focus Handling]Get rid of plugin support of IME/keyboard handling
Bug 1683779 R[Core:GFX: Color Management]Crash in [@ core::core_arch::x86::sse2::_mm_cvtps_epi32]
Bug 1683682 R[Core:GFX: Color Management]Stop exporting qcms_profile_create().
Bug 1683314 R[Core:Gecko Profiler]Intermittent GeckoProfiler.Markers | Failed
Bug 1683418 R[Core:Graphics: Text]Still a huge amount of font related heap-unclassifed memory reported
Bug 1682775 R[Core:Graphics: WebRender]Intermittent org.mozilla.geckoview.test.[<something>] | application crashed [@ RefPtr<mozilla::layers::UiCompositorControllerParent>::operator->() const] | application crashed [@ mozilla::ipc::IProtocol::ChannelSend(IPC::Message*)]
Bug 1682858 R[Core:Graphics: WebRender]Crash in [@ Allocator<T>::realloc]
Bug 1675615 N[Core:Graphics: WebRender]Refactor WebRender renderer.rs into submodules
Bug 1681756 R[Core:Graphics: WebRender]Crash in [@ mozilla::wr::DCSurface::GetTile]
Bug 1682998 R[Core:Graphics: WebRender]sw-wr: [Fission] Crash in [@ UniformMatrix4fv]
Bug 1683606 R[Core:Graphics: WebRender]sw-wr: Avoid crash by using ID3D11Texture2D that uses obsoleted ID3D11Device
Bug 1681987 R[Core:IPC]Various "no member named" build errors in FunctionBrokerIPCUtils.h with --disable-accessibility
Bug 1683480 R[Core:JavaScript Engine]Permafailing /html/semantics/scripting-1/the-script-element/module/evaluation-order-1.html | Test evaluation order of modules - assert_array_equals: expected property 2 to be "microtask" but got "global-error" when Gecko 86 merges to Beta on 2021-01-25
Bug 1679750 A[Core:JavaScript Engine: JIT]Warp: Transpile BigInt operations.
Bug 1052471 R[Core:Layout]Intermittent test_bug453650.xhtml (formerly known as test_bug453650.xul) | Test timed out.
Bug 1683227 R[Core:MFBT]Add a note to Maybe::valueOr() describing its argument is always evaluated
Bug 1682932 R[Core:Networking: Cache]ThreadSanitizer: data race [@ CacheObserver::MemoryCacheCapacity]
Bug 1683488 R[Core:Panning and Zooming]Migrate some APZ tests to async/await style
Bug 1683690 R[Core:SVG]Cleanup SVGGeometryElement::IsGeometryChangedViaCSS and related functions.
Bug 1682307 R[Core:SVG]SVG animateMotion with mpath not working as expected in combination with <head><base href="/"><head/>
Bug 1683652 R[Core:SVG]Weird rendering when changing r property value
Bug 1683132 R[Core:Storage: Quota Manager]Include nsresult value also in telemetry events
Bug 1679540 R[Core:Storage: Quota Manager]Extract CollectEachFile function and use in quota manager and clients
Bug 1682889 R[Core:Web Audio][wpt-sync] Sync PR 26926 - Address flakiness with webaudio/the-audio-api/the-pannernode-interfac…
Bug 1458145 R[Core:Web Painting]FrameLayerBuilder creates malformed layer tree (ancestor and descendant with same scroll id), leading to downstream assertion in APZ (aChild->GetApzc() != parent, at gfx/layers/apz/src/HitTestingTreeNode.cpp:89)
Bug 1671626 R[Core:Widget: Cocoa][macOS 11] No info of the currently playing content is shown on the play button from the menu bar
Bug 1465513 R[Core:Widget: Win32]dragging and dropping a document from Windows into Firefox often crashes Firefox
Bug 1682434 R[Firefox:Address Bar]Firefox freezes for 5-7 sec when trying to highlight a long form history entry (getTokenMatches::lastIndexOf is very slow)
Bug 1683581 R[Firefox:File Handling]The .jpg extension of images online got renamed .jpeg when you save them
Bug 1683244 R[Firefox:Page Info Window]Cannot save multiple selected link of Pageinfo media tab
Bug 1662553 R[Firefox:Search]Search telemetry needs thinking about/rewriting (SEARCH_COUNTS/navigation.search.*)
Bug 1683457 R[Firefox Build System:Generated Documentation]Debugger.Environment.getVariable() documentation out of date
Bug 1683628 R[Firefox Build System:Generated Documentation]Update to Sphinx 3.4.0 & recommonmark 0.7.1
Bug 1617369 N[Firefox Build System:Lint and Formatting][rust] Reformat the tree using rustfmt
Bug 1680504 R[Remote Protocol:Runtime]Implement Runtime.exceptionThrown
Bug 1683648 R[Toolkit:Themes]Remove unused pluginHelp-16.png and contentPluginDisabled.png
###########
Changes to 43 bugs - 37 fixed.
5 bugs are not included due to being restricted