Servo never made it to a place where it could consistently render most websites correctly. People underestimate the amount of work required to get something like that production ready by several orders of magnitude.

I'd love to port Servo, but the first thing people would ask after doing that, is probably when is Firefox going to be ported ;-)

I'll cast another vote for Servo. Serenity has their own native browser: https://github.com/SerenityOS/serenity/tree/master/Userland/...