Did you ditch Firefox a while ago after feeling that it was slowing down compared to rival browsers like Chrome? Mozilla is determined to win you back. As promised, it just released Firefox Quantum (aka Firefox 57) -- and it promises to be much faster than you're used to. The company claims its newest browser is over twice as fast as the version from 6 months ago thanks to both a new, multi-core CSS engine, tab prioritization and the elimination of bugs that were weighing the software down. Whether or not it's actually faster depends on the sites you're visiting, but it does appear snappy in some quick testing.