Comment 0 for bug 1995096

Firefox 105+ requires rustc 1.63 and cargo 0.64 to build¹.

The beta phase for Firefox 108.0 begins on 2022-11-14 and release candidates will be available from 2022-12-05.

We will need these in Ubuntu 23.04 and all supported releases: bionic, focal, jammy, kinetic.

¹ https://bugzilla.mozilla.org/show_bug.cgi?id=1797869

Rust toolchain upgrades are usually relatively safe from a FTBFS point of view, since new releases are subjected to a crater run, crater being a tool that compiles the entirety of the crates.io packages.