It's "functional" but has too many caveats that make it a pain to use on a daily basis. Like, tabs don't update while in the background, it keeps killing tabs after some time, scrolling on some sites is a mess because the navbar gets fucked and starts covering half the page for some reason, when certain HTML elements are too close to a hyperlink you can't click on them, etc. These are all things that worked fine on version 68 and before.