Firefox 38 for developers

Highlights:

• Bypass audio nodes in Web Audio Editor
• "copy" command in Web Console
• Highlight and filter XmlHttpRequests in Web Console
• See optimized-out variables in the Debugger
• See security warnings in the Network Monitor
• See transferred sizes in the Network Monitor
• Play/pause all animations in the page

All devtools bugs fixed between Firefox 37 and Firefox 38.

• Support for ruby-position and ruby-align have been added and is available by default (Firefox bug 1055676 Firefox bug 1123917 and Firefox bug 1039006).

• The :unresolved pseudo-class has been implemented for custom elements (Firefox bug 1111633).

• The predefined style ethiopic-numeric now uses a space, instead of a dot, as the suffix to match a recent change to the spec (Firefox bug 1120721).

• CSS transitions on generated content (with ::before and ::after) on both an inline and the block that splits them now start as expected by the specification (Firefox bug 1110277).

• The implementation of CSS Logical Properties made big progress. The following properties are available behind the layout.css.vertical-text.enabled flag (false by default):

  • Direction-independent equivalents of width and height: block-size and inline-size (Firefox bug 1117983).
  • Direction-independent equivalents of min-width and min-height: min-block-size and min-inline-size (Firefox bug 1117983).
  • Direction-independent equivalents of max-width and max-height: max-block-size and max-block-size (Firefox bug 1117983).
  • Direction-independent equivalents of margin-top, margin-right, margin-bottom and margin-left: margin-block-start, margin-block-end, margin-inline-start and margin-inline-end (Firefox bug 649142).
  • Direction-independent equivalents of padding-top, padding-right, padding-bottom and padding-left: padding-block-start, padding-block-end, padding-inline-start and padding-inline-end (Firefox bug 649142).
  • Direction-independent equivalents of border-top, border-right, border-bottom and border-left and their longhands for width, style and color: border-block-start, border-block-start-width, border-block-start-style, border-block-start-color, border-block-end, border-block-end-width, border-block-end-style, border-block-end-color, border-inline-start, border-inline-start-width, border-inline-start-style, border-inline-start-color, border-inline-end, border-inline-end-width, border-inline-end-style and border-inline-end-color (Firefox bug 649142).
  • Direction-independent equivalents of top, right, bottom and left: inset-block-start, offset-block-end, offset-inline-start and offset-inline-end (Firefox bug 1120283).

• How CSS transitions start has been modified to match a recent change of the specifications, aiming at having an interoperable behavior between browsers (Firefox bug 960465).

• The <label> element no longer dispatches events to the label target element if interactive content is found between the event target and the label (Firefox bug 229925).
• The <picture> element has been activated by default (Firefox bug 1017875).
• The <meta name="referrer"> is supported for navigations from the context menu or via a middle-click (Firefox bug 1113431).

• Generator.prototype.return() is implemented (Firefox bug 1115868).

• Setter with a rest parameter is now a SyntaxError (Firefox bug 1089632).

• The name property of functions is configurable now (Firefox bug 1084019).

• Several Array methods have been implemented for typed arrays as well:

  • The of() and from() methods (Firefox bug 896608).
  • The forEach() method (Firefox bug 1107645).
  • The filter() and map() methods (Firefox bug 1121936).
  • The slice() method (Firefox bug 1121935).

• Duplicated parameter name is no longer allowed when rest-parameter is present (Firefox bug 1096376).

• Duplicated parameter name is no longer allowed in arrow functions (Firefox bug 1096377).

• Duplicated parameter name is no longer allowed in concise method definitions (Firefox bug 1096378).

• Warning is shown when Map/Set/WeakMap constructor is called without new (Firefox bug 1108930).

• The get, has, and delete methods of WeakMap objects no longer throw when the key parameter is not an object (Firefox bug 1127827).

• The optional and non-standard second fallback parameter for WeakMap.prototype.get() has been removed (Firefox bug 1127827).

• When defining a generator method, "set" and "get" are no longer invalid names (Firefox bug 1073809).

• RegExp.prototype.source now returns "(?:)" instead of an empty string for empty regular expressions (Firefox bug 1130798).

• RegExp.prototype.source and RegExp.prototype.toString() now escape regular expression patterns properly (e.g. line terminators, "\n") (Firefox bug 1130860).

• The Regexp global, ignoreCase, multiline, and sticky properties are now prototype accessor properties rather than own data properties of RegExp instances (Firefox bug 1120169).

• The RegExp.prototype.source property is now prototype accessor property rather than own data property of RegExp instances (Firefox bug 1120169). Available only in non-Release version, due to Firefox bug 1150297.

• Function.prototype.toString() now throws for Proxy objects (Firefox bug 1100936).

• The Fetch API fetch() method has been implemented (Firefox bug 1039846).
• BroadcastChannel API has been implemented and is available in Web Workers (Firefox bug 966439 and Firefox bug 1121420).
• The Console API is now available in Web Workers.
• CanvasRenderingContext2D.clearHitRegions() has been implemented (Firefox bug 1119527).
• Constants of KeyboardEvent.location, DOM_KEY_LOCATION_MOBILE and DOM_KEY_LOCATION_JOYSTICK, have been removed, since they were removed from the DOM Level 3 Spec (Firefox bug 936313.
• KeyboardEvent.code is now available; previously it was only available in prerelease builds. (Firefox bug 1126673)
• KeyboardEvent.code now supports special keys on Sun keyboards on Linux, Android, and Firefox OS. (Firefox bug 1020139)
• The TextEncoder() constructor has been changed to match the spec: when an invalid parameter is passed, the RangeError DOMException is now raised, rather than the erroneous TypeError (Firefox bug 1125766).
• The User Timing API, adding Performance.mark(), Performance.clearMarks(), Performance.measure(), and Performance.clearMeasures() has been implemented (Firefox bug 782751).
• The prefixed version of Window.indexedDB, mozIndexedDB, has been removed (Firefox bug 975699).
• The DOMContentLoaded event is no longer cancelable (Firefox bug 1134559).
• You can now use WebSockets in Workers (Firefox bug 504553).
• The XMLHttpRequest.responseType and XMLHttpRequest.withCredentials properties can now be set before calling XMLHttpRequest.open() (Firefox bug 707484).

No change.

No change.

No change.

No change.

• In Firefox, the autocomplete=false attribute is now ignored when dealing with a login form (Firefox bug 1025703). This is intended to encourage the use of more secure passwords by allowing password manager tools to work more reliably.
• RC4 is now disabled when using TLS, except for a few specifically allowed websites. This whitelist is an interim measure until those sites are fixed (Firefox bug 1124039). This fallback is controlled by the security.tls.unrestricted_rc4_fallback preference, true by default for the moment (Firefox bug 1138882).
• Websites needing to fall back to an insecure version of TLS in order to work are now in a hardcoded whitelist which will shrink over time (Firefox bug 1114816). The whitelist can be disabled by setting security.tls.insecure_fallback_hosts.use_static_list to false.

Highlights

• sdk/context-menu@2 was implemented (Firefox bug 1070952).
• sdk/addon/bootstrap was implemented (Firefox bug 1075541).
• sdk/windows/loader was removed (Firefox bug 970135).
• Fix for default language detection on Linux (Firefox bug 1114712).
• toolkit/loader now has opt-in module compatibility checking, which is enabled for all jpm add-ons (Firefox bug 1037235).

Electrolysis (E10s) updates

• sdk/page-worker e10s updates (Firefox bug 1116004).
• sdk/content/worker e10s updates (Firefox bug 1116544).
• sdk/tabs e10s updates (Firefox bug 1033838).

Details

• GitHub commits made between Firefox 37 and Firefox 38.

No change.

Downloads.jsm

• DownloadTarget objects now have exists and size properties, allowing you to determine the existence of and the size of the download's target file on disk, as well as a new refresh() method, which asks that these values be updated.

• "@mozilla.org/network/atomic-file-output-stream;1" and "@mozilla.org/network/safe-file-output-stream;1" now throw an exception if PR_APPEND is passed without PR_TRUNCATE (Firefox bug 1117580).
• nsICompositionStringSynthesizer and nsIDOMWindowUtils.sendCompositionEvent() have been removed. Instead, use nsITextInputProcessor. (Firefox bug 917322)
• nsIDOMWindowUtils.sendKeyEvent() is now deprecated. Instead, use nsITextInputProcessor (Firefox bug 1119609).