Comment by estebank

According to https://4e6.github.io/firefox-lang-stats/, 12%.

I would love an updated version of https://docs.google.com/spreadsheets/d/1flUGg6Ut4bjtyWdyH_9e... (which stops in 2020).

For Chrome, I don't know if anyone has compiled the stats, but navigating from https://chromium.googlesource.com/chromium/src/+/refs/heads/... I see at least a bunch of vendored crates, so there's some use, which makes sense since in 2023 they announced that they would support it.