Web Extensions

• Added support for non-persistent background pages
• Fixed browser.tabs.update() to accept calls without a tabId parameter
• Fixed browser.tabs.update() to allow navigations to a URL with a custom scheme

Web Inspector

• Sources
  • Added support for creating a local override from resources that failed to load (r267977)
  • Added a + to the Local Overrides section in the navigation sidebar to streamline creating custom local overrides (r267979)
  • Fixed issue where event breakpoints were not editable after being added (r267976)
  • Fixed issue where line-based JavaScript breakpoints were not added on reload (r268629)
  • Fixed issue where the Sources Tab had wrong icon when paused (r268427)

Web Audio API

• Enabled AudioWorklet API by default (r268459)
• Added implementation for AudioWorkletGlobalScope.registerProcessor() (r268103)
• Added implementation for AudioWorkletGlobalScope‘s currentFrame, currentTime, and sampleRate attributes (r268076)
• Changed to use AudioWorkletProcessor to process audio (r268365)
• Changed calling AudioContext.resume() right after AudioContext.suspend() to be a no-op (r268368)
• Changed AudioWorkletGlobalScope to perform a microtask checkpoint after each rendering quantum (r268369)
• Fixed parameters argument for AudioWorkletProcessor.process() to be spec-compliant (r268414)

MediaRecorder

• Enabled video capture by default on macOS (r268052)
• Added support for MediaRecorder bitrate getters (r268363)
• Added support for MediaRecorder pause and resume (r268130)
• Added support for respecting enabled and muted tracks (r267987)
• Added support for BlobEvent.timecode (r268136)
• Fixed MediaRecorder .stop to not throw in Inactive state (r268477)
• Made sure to fire the correct set of events in case MediaRecorder stream has track changes (r268119)

CSS

• Added support for the individual transform properties translate, rotate, scale, including accelerated animation (r267985, r268627)
• Fixed flex-grow property to be animatable (r268516)
• Fixed CSS image-orientation: none to be ignored for cross-origin images (r268249)
• CSS transform computed style should not reflect individual transform properties (r268263)
• Added painting CSS highlights over images (r268487)
• Fixed clip-path: path() ignoring page zooming (r268138)
• Fixed background-clip: var(--a) invalidating -webkit-background-clip: text when --a: text (r268158)

Rendering

• Respect the font size when presenting the <select> dropdown when custom fonts are used (r268126)

JavaScript

• Changed arguments.callee to become ThrowTypeError if the function has a complex-parameter-list (spec-term) (r268323)
• Changed BigInt constructor to be constructible while it always throws an error (r268322)
• Fixed Array.prototype.sort‘s sortBucketSort which accessed an array in an invalid way leading to incorrect results with indexed properties on the prototype chain (r268375)
• Improved the essential internal methods for %TypedArray% to adhere to spec (r268640)

WebAuthn

• Removed the alg field from the attestation statement (r268602)

Media

• Fixed AirPlay menu not showing up when the AirPlay button is clicked (r268308)
• Improved computation of default audio input and output devices (r268396)

Web API

• Allowed passive mouse wheel event listeners to not force synchronous scrolling (r268476)
• Implemented Blob.stream (r268228)
• Updated FileReader.result to return null if it isn’t done yet (r268232)
• Improved xhr.response conformance to the specification (r267959)

URL Parsing

• Aligned URL setters to reasonable behaviors of other browsers (r268050)
• Changed to parse “#” as a delimiter for fragment identifier in data URIs (r267995)
• Changed to fail parsing URLs with hosts containing invalid punycode encodings (r267965)
• Fixed UTF-8 encoding in URL parsing (r267963)

Storage Access API

• Enabled per-page storage access scope (r267973)

Accessibility

• Fixed accessibility on Presidential Executive Order pages (r268117, r268206)

WebDriver

• Fixed WebDriver Input clear/value commands when the target is inside a Shadow DOM (r267978)