brings responsive image support via the picture element and source set attribute to img, WebSockets support in the Web Worker thread separate from the UI, ruby annotation markup support, the BroadcastChannel client-side message passing API has been added to let multiple tabs/windows communicate, new tab-based preferences, a copy command was added to the developer console, and WebRTC now has multi-stream and renegotiation support.(...)http://www.nextinpact.com/news/94075-firefox-38-prend-en-charge-eme-mais-netflix-doit-donner-son-feu-vert.htmet une version sans DRM :http://techcrunch.com/2015/05/12/mozilla-launches-a-new-firefox-version-without-drm-support/