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** '''Why Rust?''' Code taken from Servo, uses parallel algorithms.
* U2F HID backend: {{bug|1388843}} (shipped in Firefox 57)
* libcubeb Audio backend for Linux (PulseAudio): {{bug|1346665}} (shipped in Firefox 59)
* XPIDL binding generator ({{bug|1293362}}) (shipped in Firefox 60)
* New prefs parser: {{bug|1423840}} (shipped in Firefox 60)
* 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 complexityassist productivity, and allow more aggressive optimizations.
* kvstore (key-value storage backed by LMDB): {{bug|1490496}} (shipped in Firefox 67)
** '''Why Rust?''' The rkv crate provides a safe, ergonomic wrapper around LMDB, our choice for simple key-value storage in Firefox. kvstore wraps rkv in an asynchronous XPCOM API for JS and C++ callers.
* Japanese encoding detector: {{bug|1543077}} (shipped in Firefox 69)
** '''Why Rust?''' Builds upon encoding_rs, has tiny FFI surface, subject matter prone to accesses past the bounds of a buffer.
* [https://github.com/padenot/audio_thread_priority audio_thread_priority] {{bug|1429847}} (shipped in Firefox 69), allow promoting threads to a real-time scheduling class, on Windows/Linux/macOS.
** '''Why Rust?''' This crate is being used by C++ code and by Rust code (audioipc), Rust is nicer to write than C++ (especially for what is essentially just a series of system calls, the error checking style is nice), and cbindgen made it trivial to expose a C ABI.
* [https://github.com/mozilla/dogear/ Dogear] a bookmark merger for Sync. Shipped pref'd-off in {{bug|1482608}} (Firefox 68), enabled by default in {{bug|1588005}} (shipped in Firefox 72)
** '''Why Rust?''' A single performant and safe implementation shared between desktop and the bookmarks engine in [https://github.com/mozilla/application-services/tree/master/components/places application-services]
* Unicode Language Identifier: {{bug|1571915}} (shipped in Firefox 72)
** '''Why Rust?''' Much faster, parser-heavy, easier to handle low-memory footprint thanks to `tinystr`.
* Encoding detector: {{bug|1551276}} (shipped in Firefox 73)
** '''Why Rust?''' Builds upon encoding_rs, has tiny FFI surface, subject matter prone to accesses past the bounds of a buffer, potentially parallelizable with Rayon.
