It's not the entire layout engine that changes. They only switch to the CSS Style system of Servo: https://www.reddit.com/r/rust/comments/6p9s24/psa_you_can_try

It's not the entire layout engine that changes. They only switch to the CSS Style system of Servo: https://www.reddit.com/r/rust/comments/6p9s24/psa_you_can_try_out_stylo_in_firefox_nightly_now/dknyjpe/ https://www.reddit.com/r/rust/comments/6p9s24/psa_you_can_tr... It's still pretty cool though :)