I actually do use Firefox, but don't forget that it basically was a skunworks alternative to the feature creep that was the Netscape suite. And then there's Grendel. Not that Google doesn't have the same issues on a bigger scale, so even though both Rust and Go have some backing, it doesn't mean that both can't be canceled straightaway.

There actually might be more renewed interest in C++ (in its current C++11 reincarnation) than actually new interest in Go/Rust. (Chances of someone reviving Modula-3 or creating a killer framework for Ada will remain low)