Firefox

Firefox 60 for developers

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This article provides information about the changes in Firefox 60 that will affect developers. Firefox 60 is the current Nightly version of Firefox, and will ship on May 8, 2018.

Stylo comes to Firefox for Android in 60

Firefox's new parallel CSS engine — also known as Quantum CSS or Stylo, which was first enabled by default in Firefox 57 for desktop, has now been enabled in Firefox for Android.

Changes for web developers

Developer tools

  • In the CSS Pane rules view (see Examine and edit CSS), the keyboard shortcuts for precise value increments (increase/decrease by 0.1) have changed from Alt + Up/Down to Ctrl + Up/Down on Linux and Windows, to avoid clashes with default OS-level shortcuts (see Bug 1413314).
  • Also in the CSS Pane rules view, CSS variable names will now auto-complete (Bug 1422635). If you enter var( into a property value and then type a dash (-), any variables you have declared in your CSS will then appear in an autocomplete list.

HTML

Pressing the Enter key in designMode and contenteditable now inserts <div> elements when the caret is in an inline element or text node which is a child of a block level editing host — instead of inserting <br> elements like it used to. If you want to use the old behavior on your app, you can do it with document.execCommand(). See Differences in markup generation for more details.

CSS

SVG

No changes.

JavaScript

The Array.prototype.values() method has been added again (Bug 1420101). It was disabled due to compatibilty issues in earlier versions. Make sure your code doesn't have any custom implementation of this method.

APIs

New APIs

No changes.

DOM

DOM events

No changes.

Service workers

No changes.

Media and WebRTC

Canvas and WebGL

No changes.

CSSOM

No changes.

HTTP

No changes.

Security

No changes.

Plugins

No changes.

Other

No changes.

Removals from the web platform

HTML

No changes.

CSS

JavaScript

The non-standard expression closure syntax has been removed (Bug 1426519).

APIs

No changes.

SVG

No changes.

Other

No changes.

Changes for add-on and Mozilla developers

WebExtensions

No changes.

See also

  • Site compatibility for Firefox 60

Older versions

 

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