Neither Firefox nor Servo use async http requests in the Rust code. The only Rust code in Firefox's network stack is the URL parser. The rest of the stack is i

Neither Firefox nor Servo use async http requests in the Rust code. The only Rust code in Firefox's network stack is the URL parser. The rest of the stack is in C++, and I believe it handles async. Servo's network code is still pretty premature. I plan to poke at tokio-ifying it at some point, or at least having better thread pooling.