The WebKit implementation is the only one that can handle many pages of text with no noticeable performance hit, while Chrome and Firefox are limited to only dealing with the last 4 or 6 lines of a paragraph.
Firefox doesn't have this feature at all.
I was curious as it seems like a nice thing to have and I use Firefox, so I looked it up. It's been suggested and you can upvote it here: https://connect.mozilla.org/t5/ideas/text-wrap-pretty-for-de.... Per the last post there (Aug 24).
> Mozilla standard position on this feature is positive > https://github.com/mozilla/standards-positions/issues/993