We talked a bit about Firefox Quantum a couple months ago, and quite frankly the Quantum browsing experience was surely faster if nothing else. Yesterday, Firefox start pushing out release 58.0, and it has a quite a few updates listed. Mozilla claims even better page loading times due to Off-Main-Thread Painting (OMTP), and how Firefox handles Javascript. And if you are wondering about security, there is an extremely long page with those specifics. Outside of speed, Opt-In Tracking Protection will probably be of interest.
With Opt-In Tracking Protection, Firefox users protect their privacy and get a better, faster experience when their web pages load without trackers.
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Source: [H]ardOCP – Firefox Quantum Gets Updates with FF58