Firefox fork compatible with legacy addons.
Ranked in these QuestionsQuestion Ranking
Even faster than firefox.
Pro Never ever freezes
Pro Works with Firefox addons
Firefox 56 add-ons compatibility, including unsigned XUL extensions and complete themes.
Pro Offers excellent privacy
Does not phone home.
Pro Extremely customizable
It has almost every setting imaginable.
Pro Less bloated than Firefox
Pocket, telemetry, data collection, startup profiling is removed.
Pro Multiple add-on support
Pro Works with major streaming services
Includes widevine plugin and suitable user agent for viewing major streaming services like Netflix and Amazon Video.
Con Goodish, but still bad
Removes crap from FF, but doesn't offer anything you can't already do in FF. Also, doesn't help they are owned by an ad tech, System1.
Con Lag, lag, lag, freeze, freeze, freeze
Need to do something about it.
Con Owned by an advertising company
The same company that bought Startpage.