These browsers are all constantly accessing many sites. Here's[1] a comment I posted a month ago about Firefox. The summary is here's (at minimum) what Firefox

These browsers are all constantly accessing many sites. Here's[1] a comment I posted a month ago about Firefox. The summary is here's (at minimum) what Firefox accesses when it starts up as a Guest in OS X, and this is after I unchecked a bunch of boxes: self-repair.mozilla.org snippets.cdn.mozilla.net search.yahoo.com location.services.mozilla.com www.mozilla.org tiles.services.mozilla.com safebrowsing.google.com aus4.mozilla.org Try it yourself as Guest. But make sure that Parental Controls are on. That way OS X will popup these sites and ask permission. Firefox is unusable w/o opting in all of these. [1] https://news.ycombinator.com/item?id=9743799 https://news.ycombinator.com/item?id=9743799