mozilla

Firefox 24 for developers

Changes for Web developers

CSS

  • The two values -moz-zoom-in and -moz-zoom-out of the cursor property have been unprefixed to zoom-in and zoom-out (bug 772153).
  • To match the specification, the keywords not, only, and, and or cannot be used as media types anymore (bug 757554).

HTML

  • The <track> element has been implemented behind the media.webvtt.enabled property (bug 833385).

JavaScript

DOM

Developer Tools

  • The Network inspector now lets you filter by content type (CSS/image/font etc.) and see the relevant size and load times.
  • The Devtools options panel to the left lets you disable/enable Javascript temporarily.
  • Extension developers may use the new Browser Console for Chrome-level scripts (Replaces Error Console).

MathML

  • The dir attribute for controlling directionality of formulas on e.g. <math> or <mrow> elements is now equivalent to using the direction CSS property.
  • The equal sign ("=") is now stretchable.
  • The "updiagonalarrow" value for the notation attribute on <menclose> elements has been added.

Changes for add-on and Mozilla developers

  • Doc Shells have now the allowMedia attribute to disable media playing (bug 759964).

See also

Older versions

Document Tags and Contributors

Last updated by: fscholz,