The Fullscreen API has been unprefixed with Firefox 47. The non-standard, prefixed methods and properties are now considered deprecated and may be removed in the future.
document.mozFullScreen property has no exact standard equivalent. Use
Update: Due to several site compatibility issues, the unprefixed API has been disabled in the Beta and Release channels and will be re-enabled in the future. We have updated this document’s title accordingly. The unprefixed API remains enabled in the Nightly and Aurora (Developer Edition) channels so that Web developers can test their sites. Note that there is a proposal to implement
document.fullscreen as the unprefixed version of
document.mozFullScreen to make the transition easier.