** '''Why Rust?''' Old parser needed replacing. Well-separated component, simple interface, parses untrusted input.
* Audio remoting for Linux: {{bug|1434156}} (shipped in Firefox 60)
* WebRender: {{bug|webrender}} (shipped in Firefox 67, enabled for users with appropriate hardware)
** '''Why Rust?''' Code taken from Servo, has high performance; Rust's memory and thread safety provides protection against complexity.