Firefox 48: first Rust component onboard

"... Firefox 48 will be the first version of Firefox that ships with a Rust component. The component in question is a media parser written in Rust. That may not sound too exciting at first, but considering that media playback code is a primary attack vector on desktop and mobile systems alike, it is of significance. ..."
Source: gHacks Tech News
Details  Firefox 48: first Rust component onboard