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    Firefox 24 for developers

    Changes for Web developers


    • 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).


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



    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).


    • 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,