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Firefox 67 release notes for developers

files/en-us/mozilla/firefox/releases/67/index.md

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This article provides information about the changes in Firefox 67 that will affect developers. Firefox 67 was released on May 21, 2019.

Changes for web developers

Developer tools

  • Debugger updates:

    • Column breakpoints allow you to select the specific point (or column) in a line of code where you want the debugger to break (Firefox bug 1528417).
    • Log points allow you to log specific information to the console during code execution without pausing execution and without the need to change the code.
    • The map scopes feature allows you to view the variables from the original source.
    • You can debug worker threads directly in the debugger.

  • Web Console updates:

    • Navigate details in the console using the keyboard (Firefox bug 1424159).
    • Cmd + K will now clear the console of its contents on macOS (Firefox bug 1532939).
    • When the user clears the console, the error messages cache is cleared as well (Firefox bug 717611).
    • The user can import existing modules into the current page using import (Firefox bug 1517546).
    • A new context menu item allows the user to use the Copy Link Location command (Firefox bug 1457111).
    • Clicking a link in the Console causes the same behavior that it would in a content window (Firefox bug 1466040).
    • Clicking the source link for a code file in the Console panel navigates to the Debugger if debugger knows the file (Firefox bug 1447244).
    • When the user has filtered the contents of the console, an icon will be added to the filter text box to clear the filter (Firefox bug 1525821).

  • Network Monitor enhancements:

Removals

HTML

  • {{htmlelement("input")}} elements with autocomplete="new-password" set on them will no longer have previously saved passwords auto-filled (Firefox bug 1119063).

CSS

Removals

  • Use of the proprietary -moz-binding property is now restricted to chrome and UA-stylesheets (Firefox bug 1523712).

SVG

No changes.

JavaScript

APIs

DOM

  • The default value for {{domxref("Response.statusText")}} is now "" (Firefox bug 1508996).
  • User gestures are now preserved for rejected calls to {{domxref("Document.requestStorageAccess")}}, as well as fulfilled calls (Firefox bug 1522912).

DOM events

Workers/Service workers

  • Strict MIME type checks are now enforced on scripts imported by {{domxref("WorkerGlobalScope.importScripts()")}} (Firefox bug 1514680).

Media, Web Audio, and WebRTC

  • The AV1 video codec is now supported on Linux.
  • dav1d is now the default media decoder for AV1 (see for example Firefox bug 1533742 and Firefox bug 1535038).
  • Calling {{domxref("RTCPeerConnection.addTrack()")}} without specifying any streams to which to add the new track now works as expected: it adds a streamless track to the connection. Each peer is responsible for managing the association between the track and any stream on its end (Firefox bug 1231414).
  • The {{domxref("MediaDeviceInfo.groupId")}} property is now implemented (Firefox bug 1213453). While it has existed in Firefox since Firefox 39, it did not actually gather related devices together into the same group IDs.
  • The {{domxref("RTCIceCandidate.usernameFragment")}} property is now implemented (Firefox bug 1490658).
  • WebVTT has been revised to correctly use auto as the default for the {{domxref("VTTCue")}} object's {{domxref("VTTCue.positionAlign", "positionAlign")}} property, instead of center. This causes the cue box's alignment to correspond to the alignment of the text within it (Firefox bug 1528420).

Canvas and WebGL

Removals

  • The deprecated ShadowRoot.getElementsByTagName, ShadowRoot.getElementsByTagNameNS, and ShadowRoot.getElementsByClassName properties (part of Shadow DOM v0) have been removed (Firefox bug 1535438).
  • document.createEvent("TouchEvent"), {{domxref("document.createTouch()")}}, {{domxref("document.createTouchList()")}}, and the ontouch* event handler properties have been disabled on desktop to improve web compatibility on websites where touch support is used for mobile detection (Firefox bug 1412485). In such cases, websites have been seen to behave incorrectly or unexpectedly on touchscreen laptops.

Security

WebDriver conformance (Marionette)

API changes

Bug fixes

  • WebDriver:NewWindow will no longer timeout because inconsistencies across platforms regarding the focus event (Firefox bug 1523234).

Others

  • Both WebDriver:ExecuteScript and WebDriver:ExecuteAsyncScript now use Promises internally (Firefox bug 1398095).
  • WebDriver:NewSession returns Firefox's BuildID string as part of the capabilities object (Firefox bug 1525829).

Changes for add-on developers

API changes

  • Using the proxy.settings.set() method to change {{WebExtAPIRef("types.BrowserSetting", "BrowserSetting")}} values will throw an exception unless the extension was granted private window access by the user (Firefox bug 1525447).

Manifest changes

  • A new manifest key, incognito, defines the behavior of an extension in private browsing windows or tabs (Firefox bug 1511636).
  • The toolbar_field_highlight setting controls the background color used to indicate the current selection of text in the URL bar (Firefox bug 1450114).
  • The toolbar_field_highlight_text setting controls the text color used to indicate the current selection of text in the URL bar (Firefox bug 1450114).

See also