Bug to turn on by default: https://bugzilla.mozilla.org/show_bug.cgi?id=1704595
This feature was previously discussed in this "Intent to prototype" thread [3].
[1] https://www.chromestatus.com/feature/5757293075365888
[3] https://groups.google.com/g/mozilla.dev.platform/c/bTEmQxffGvA/m/_foj0Q8uBwAJ