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This article provides information about the changes in Firefox 62 that will affect developers. Firefox 62 is the current Beta version of Firefox, and will ship on September 5, 2018.

Changes for web developers

Developer tools

  • The Developer Toolbar (accessed with  Shift+F2, has been removed from Firefox.
  • You now have four options for the location of the Developer Tools. In addition to the default location on the bottom of the window, you can choose to locate the tools on either the left or right sides of the main window or in a separate window.
  • You can now split the Rules view out into its own pane, separate from the other tabs on the CSS pane. See Page inspector 3-pane mode for more details.
  • The Grid inspector has updated features, and all new documentation — see CSS Grid Inspector: Examine grid layouts.
  • The Accessibility inspector has had a couple of minor updates:
    • It no longer exposes the help property, which isn't properly implemented in Gecko (bug 1467643).
    • The keyboardShortcut property now correctly exposes any keyboard shortcut available to activate the currently inspected node (bug 1467381).
  • A close button has been added to the toolbar of the split console.
  • If the option to "Select an iframe as the currently targeted document" is checked, the icon will appear in the toolbar while the Settings tab is displayed, even if the current page doesn't include any iframes.
  • The Network Monitor's Cookies tab now shows the cookie samesite attribute (bug 1452715).

HTML

No changes.

CSS

SVG

No changes.

JavaScript

APIs

New APIs

DOM

DOM events

No changes.

Service workers

No changes.

Media, Web Audio, and WebRTC

  • The "media.autoplay.enabled" preference now controls automatic playback of both audio and video media, instead of just video media (bug 1413098).
  • The ChannelSplitterNode has been fixed to correctly default to having 6 channels with the channelInterpretation set to "discrete" and the channelCountMode set to "explicit" per the specification (bug 1456265).

Canvas and WebGL

No changes.

CSSOM

HTTP

Security

No changes.

Plugins

No changes.

Other

No changes.

Removals from the web platform

HTML

No changes.

CSS

No changes.

DOM

SVG

No changes.

Other

No changes.

Changes for add-on and Mozilla developers

WebExtensions

API changes

Manifest changes

Theme changes

  • New tab_background_separator property of the theme manifest key enables extensions to change the color of the tab separator.

Other changes

  • Support for unpacked sideloaded extensions has been removed (bug 1385057).

See also

  • Site compatibility for Firefox 62

Older versions

Document Tags and Contributors

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Contributors to this page: chrisdavidmills, irenesmith, wbamberg, fscholz, Sheppy
Last updated by: chrisdavidmills,