Has it actually got Quantum DOM as well? I was under the impression that it was merely Electrolysis and Quantum Compositor (i.e. the speedups from Firefox 54), and that the massive on from 57 was still set to arrive?
- when you swipe fast, the page only scrolls by like 30%, instead of scrolling by 200% like in Chromium browsers. Basically it's impossible to quickly scroll a long page on Firefox (maybe it's configurable somehow in about:config?)
- when you long-press a link, it takes like 2-3 seconds for the menu to open. As I "open in new tab" by default, this quickly adds up.