Hearing good things about firefox performance vs. chrome in this thread, I thought I would have a look at firefox use of rust - I found this informative page which provides a lot of rationale for where rust has been used:
https://wiki.mozilla.org/Oxidation
Here is a cut of what was introduced in Firefox 76 (copy&paste)
Integrate fluent-rs, a localization system: bug 1560038 (shipped in Firefox 76)
Why Rust? Performance and memory wins are substantial over previous JS implementation. It brings zero-copy parsing, and memory savvy resolving of localization strings. It also paves the way for migrating the rest of the Fluent APIs away from JS which is required for Fission.
Here is a cut of what was introduced in Firefox 76 (copy&paste)
Integrate fluent-rs, a localization system: bug 1560038 (shipped in Firefox 76)
Why Rust? Performance and memory wins are substantial over previous JS implementation. It brings zero-copy parsing, and memory savvy resolving of localization strings. It also paves the way for migrating the rest of the Fluent APIs away from JS which is required for Fission.