The following Document.execCommand() UI feature commands have been disabled by default ( bug 1490641:. Navigator.buildID now returns a fixed timestamp as a privacy measure ( bug 583181). The legacy HTMLAllCollection interface has been updated as per recent spec updates ( bug 1398354). The XMLHttpRequest.getAllResponseHeaders() method now returns header names all in lowercase, as per spec ( bug 1398718). Window.screenLeft and Window.screenTop have been implemented, as aliases of Window.screenX and Window.screenY ( bug 1498860). The WebVR API (1.1) is now re-enabled in macOS ( bug 1476091). 
This matches the latest specification as well as the behavior of Google Chrome ( bug 1375319). This has been reversed so that the element gets the event first.
Previously, fullscreenchange and fullscreenerror events were dispatched to the Document first, then the Element. The Element.requestFullscreen() and Document.exitFullscreen() methods both now return a Promise, which is resolved when the mode change is complete ( bug 1188256 and bug 1491212). The API has been unprefixed ( bug 1269276). A number of changes related to the Fullscreen API have been implemented:. A previous change - to swap the values of the 2-value overflow syntax so block is specified first and inline second ( bug 1481866) - has been reverted ( bug 1492567). The preference has been removed CSS filters can no longer be disabled ( bug 1408841). The non-standard ::-moz-tree pseudo-elements have been hidden from web content ( bug 1496961). The non-standard -moz-box and -moz-inline-box display values have been hidden from web content ( bug 1496961). If a selector chain or group includes a -webkit-prefixed pseudo-element, that pseudo-element no longer invalidates it (see bug 1424106 for the details, and bug 1486325 for enabling this feature). SVG path()s, as usable in offset-path, are now animatable ( bug 1486094). display: list-item is now supported on elements ( bug 1486602). 
Closely associated with the above update, we've also removed most of the Firefox-specific -moz-appearance values ( bug 1496720).Support added for -webkit-appearance to alleviate associated web compat issues ( bug 1368555).The text-transform property now accepts the full-size-kana value ( bug 1498148).CSS values now support multi-position color stop syntax, e.g.
#Firefox developer edition 40 for android
The prefers-reduced-motion media feature is now supported in Firefox for Android ( bug 1478505). For any-pointer and any-hover implementation, see bug 1483111. Interaction Media Features implemented, including pointer:coarse ( bug 1035774). CSS Scrollbars spec functionality has been enabled by default ( bug 1492012).
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