The Object.prototype._noSuchMethod_ property is now deprecated and throws a console warning (see bug 1140428 and this platform announcement).The RegExp constructor no longer throws when the first argument is a RegExp and the second flags argument is present ( bug 1108949).Support for allowing to anticipate a future connection without revealing any information has been implemented ( bug 1135160).A new ARIA role, switch, is now supported ( bug 1136563).CSS filter acts like position: relative + overflow: hidden ( bug 1125767).Note that implementation is not yet complete and some widgets, like tables, will not obey to all values. Support for vertical scripts, with the writing-mode is now turned on by default on Nightly and Developer Edition, but not on Firefox Beta and Firefox Release ( bug 1099032).Cascading of CSS Animations and CSS Transitions has been rewritten to match the latest specification ( bug 1125455).CSS Scroll Snapping has been implemented ( bug 945584 and bug 1138658).Support of the type on list-style-type, as well as its shorthand property list-style has been implemented ( bug 1144607).Better box model highlighting for inline elementsĪll devtools bugs fixed between Firefox 38 and Firefox 39.$_ console command to print the last result evaluated.Web console command history is now persisted across sessions.Drag and drop elements in the Page Inspector.The cubic Bézier curve editor now includes 31 presets.Animations view: rewind, fast-forward, and jump to a specific time.WebIDE now supports debugging Firefox OS devices over Wi-Fi.Changes for Web developers Developer Tools This article lists key changes that are useful not only for web developers, but also Firefox and Gecko developers as well as add-on developers.
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