Firefox 69 for developers

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This article provides information about the changes in Firefox 69 that will affect developers. Firefox 69 is the current Beta version of Firefox, and will ship on September 3, 2019.

Changes for web developers

Developer tools

  • An icon will be displayed next to invalid or unsupported CSS rules in the Rules pane of the Page Inspector (bug 1306054).
  • The debugger now includes the ability to set a breakpoint on event handlers. For example, you can select keydown, and execution will pause when it enters any keydown event handler in your project (bug 1526079).
  • When you hover over an element in the Page Inspector, the infobar that appears now includes the fact that an element is a flex container, or flex item (bug 1521188).

Removals

HTML

  • In order to align more closely to the specification, the text track associated with a <track> element no longer loads the WebVTT file containing the text cues if the element is created in its default disabled mode. To access or manipulate the cues when the mode is disabled, change the mode to either started or hidden; this will trigger loading of the WebVTT data (bug 1550633).

 Removals

  • The HTML <keygen> element has been removed from Firefox. It was deprecated some time ago, and its purpose has generally been supplanted by other technologies (bug 1315460).

CSS

  • Implement the break-spaces value of the white-space property (bug 1351432).
  • Implement SVG geometry properties in CSS (bug 1383650).
  • The ::cue selector—used to style the captions ("cues") displayed by WebVTT—now enforces the limitations on which CSS properties may be used within cues, per the specification.
  • Properties which may apply to `::marker` restricted as per the specification (bug 1552578)
  • The overflow-block and overflow-inline properties have been implemented (bug 1470695).
  • Adds the ability to test for support of a selector when using CSS Feature Queries (@supports), with the `selector()` method (bug 1513643).
  • The user-select property—which specifies whether or not the user is able to select text in the affected element—has been unprefixed in Firefox 69 (bug 1492739).

Removals

SVG

Removals

JavaScript

Removals

HTTP

APIs

No changes.

New APIs

DOM

DOM events

Service workers

Media, Web Audio, and WebRTC

Canvas and WebGL

Removals

Security

No changes.

Removals

Plugins

No changes.

Removals

Other

No changes.

Removals

Changes for add-on developers

API changes

No changes.

Removals

Manifest changes

No changes.

Removals

See also

Older versions