Bug 1687899 R[Core:Audio/Video]Some semantic improvements for `timeupdate` dispatchment part
Bug 1687073 A[Core:Canvas: WebGL]Permafailing tier 2 dom/canvas/test/webgl-conf/generated/test_2_conformance2__textures__misc__tex-image-with-bad-args-from-dom-elements.html | getError expected one of: INVALID_VALUE or INVALID_ENUM or INVALID_OPERATION. Was NO_ERROR : TexImage2D
Bug 1687071 A[Core:Canvas: WebGL]Permafailing tier 2 dom/canvas/test/webgl-conf/generated/test_2_conformance__textures__misc__texture-upload-size.html | getError expected: NO_ERROR. Was INVALID_VALUE : when calling texSubImage2D with the same texture upload
Bug 1688214 R[Core:DOM: Core & HTML]Perma central-as-beta /custom-state-pseudo-class/idlharness.window.html | idl_test setup - promise_test: Unhandled rejection with value: object "TypeError: myElement.attachInternals is not a function" when Gecko 86 merges to beta on 2021-01-25
Bug 1677899 A[Core:DOM: Core & HTML]Intermittent browser/base/content/test/fullscreen/browser_fullscreen_window_focus.js | Test timed out - | Found a tab after previous test timed out: http://example.com/browser/browser/base/content/test/fullscreen/open_and_focus_helper.html
Bug 1572798 N[Core:DOM: Core & HTML]Video element created using document.open() doesn't work
Bug 1688089 R[Core:DOM: Events]Add use counters for `overflow`/`underflow` event listeners
Bug 1673617 A[Core:DOM: Navigation]Reduce complexity of session restore with SHIP
Bug 1687890 R[Core:DOM: Security]Relax Principal Validation in Content Parent until we have Telemetry Pings
Bug 1688127 R[Core:DOM: Security]WARNING: NS_ENSURE_TRUE(browsingContext->IsContentSubframe()) failed: file dom/base/Document.cpp:3704 on every crashtest
Bug 1685303 N[Core:DOM: Selection]Fortify code around `AccessibleCaretManager::OnSelectionChanged`
Bug 1688109 R[Core:DOM: postMessage]BroadcastChannel doesn't reliably remove the page from BFCache when a message is received
Bug 1686238 R[Core:Disability Access APIs]Perma TEST-UNEXPECTED-FAIL | accessible/tests/browser/mac/browser_app.js | Context menu on link contains fifteen items - Got 14, expected 15 when Gecko 86 merges to Beta on 2021-01-25
Bug 1686995 R[Core:Disability Access APIs]AXTextSelectionDirection and AXTextSelectionGranularity are needed for caret feedback in entries
Bug 1685937 R[Core:Gecko Profiler]Revisit inter-sampling sleep time, to avoid tiny sleeps
Bug 1688086 R[Core:Graphics]Unnecessary CPU usage on the main thread from compositor vsync notifications
Bug 1682861 N[Core:Graphics]ThreadSanitizer: lock-order-inversion (potential deadlock) [@nsDOMWindowUtils::CompareCanvases]
Bug 1688303 R[Core:Graphics: WebRender]cs_scale shader is slow in SW-WR
Bug 1674473 R[Core:Graphics: WebRender]sw-wr: Linux: Main menu shadow becomes stronger when hovering different entries
Bug 1687463 R[Core:JavaScript Engine]Replace mozilla::{ArrayLength,ArrayEnd} with STL functions
Bug 1688190 R[Core:JavaScript Engine]AddressSanitizer: SEGV or Assertion failure: !warmUpData_.isEnclosingScript() (Enclosing scope is not computed yet), at vm/JSScript.cpp:705
Bug 1688202 R[Core:JavaScript Engine]Use TypeDescr instead JSObject in ObjectGroupRealm and remove more unused functions
Bug 1686846 R[Core:JavaScript Engine]Consider merging cache/alloc for initial and delazifications in CompilationStencilSet
Bug 1688238 R[Core:JavaScript: GC]Rename sweepMarkTask in preparation for concurrent marking
Bug 1687920 R[Core:JavaScript: GC]Improve assertions about nursery forwarding pointers
Bug 1687956 R[Core:JavaScript: GC]Refactor chunk data structures to inherit from a common base class
Bug 1686772 R[Core:JavaScript: GC]Add high-level documentation for the garbage collector
Bug 1686755 R[Core:Javascript: WebAssembly]WebAssembly.Table API doesn't support ref-types correctly
Bug 1688141 R[Core:Layout]Use AspectRatio instead of StyleAspectRatio in ComputeSize() and ComputeTransferredMinMaxInlineSize()
Bug 1687795 R[Core:Layout]Minor improvements for mBSizeIsSetByAspectRatio flag
Bug 1688076 R[Core:Networking: DNS]Reset TRR skipped reason when re-resolving a DNS record
Bug 1685395 R[Core:Panning and Zooming]Use runtime detection of the GTK version to enable touchpad zooming on Linux
Bug 1682877 R[Core:Printing: Output]Crash in [@ mozilla::ipc::FatalError | mozilla::ipc::IPDLParamTraits<T>::Read] after cancelling file picker with print to PDF
Bug 1516552 R[Core:Privacy: Anti-Tracking]ETP Strict delays the visibility of all site content because of blocked GA/GTM resources
Bug 1682723 R[Core:Sanitizers]Enable web-platform-tests as Tier1 on TSan
Bug 1684061 R[Core:Security: PSM]Upgrade Firefox 86 to use NSS 3.61
Bug 1688164 R[Core:Storage: Quota Manager]dom.quota.try telemetry events are missing WIN32 API errors
Bug 1688004 N[Core:Web Painting]Fix top layer image painting in the browser chrome.
Bug 1674431 R[Core:Widget: Gtk]Spin button appearance makes text entry unreadable, <input type="number"> covered by wide buttons
Bug 1688308 R[Core:XPCOM]Add a profiler marker when microtasks are executed
Bug 1688170 R[DevTools:Netmonitor]Enable resource tests for NETWORK_EVENT/NETWORK_STACKTRACE_EVENT
Bug 1680216 R[Firefox:Bookmarks & History]Measure time to render the contents of the bookmarks toolbar to assess whether we need placeholders (like skeleton UI)
Bug 1686374 R[Firefox:Bookmarks & History]Extend pre-xul skeleton UI to set correct margins based on the bookmarks toolbar
Bug 1681138 R[Firefox:Bookmarks & History]Avoid delaying bookmarks toolbar initialization for new windows post-startup
Bug 1687380 R[Firefox:General]window.alert plays sound when `prompts.contentPromptSubDialog=true`
Bug 1686229 R[Firefox:Launcher Process]Record blocked modules in third-party module ping
Bug 1680794 R[Firefox:Messaging System]What's new - focus ring: focus only the "learn more" link
Bug 1687048 R[Firefox:New Tab Page]New Tab: AS Telmetry for snippets and top sites.
Bug 1688032 R[Firefox:New Tab Page]Customize Menu - Click outside the menu should close the menu.
Bug 1687809 R[Firefox:New Tab Page]Learn more link should align with the pocket header on the baseline if newNewtabExperience is enabled
Bug 1664847 R[Firefox:Search]Log the search access point for ad clicks and searches with ads
Bug 1513680 R[Firefox:Search]Restrict ContentSearch messages to the Activity Stream Process
Bug 1685729 R[Firefox:Top Sites]Refresh top sites on region change
Bug 1687530 R[Firefox Build System:General]Fix linux reproduced builds tiers
Bug 1688235 R[Firefox Build System:General]Remove autocfg warning spew
Bug 1687375 R[Toolkit:Add-ons Manager]UX: Badge descriptions may give undesired impression
###########
Changes to 60 bugs - 52 fixed.
2 bugs are not included due to being restricted