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If you've ever run into an issue with Safari where it stalls and never loads a web page, yet other browsers work okay, then this just might be the answer to your dreams.   Since Safari tries to load a page and then immediately fails, and you've verified you do have Internet access with another browser like Firefox, it's safe to assume there's a DNS issue (if DNS breaks, you simply can't find web pages by their name). Specifically it's a switch for something called DNS prefetching.   I have personally seen this issue under OS X Mavericks 10.9.5, but it's been a known problem since at least Safari 5.01 under OS X 10.7 Lion. DNS prefetching is enabled by default, and on some machines, with some routers, it can break Safari completely. Disabling prefetching isn't something you can do in Safari's preferences, but you can still tell OS X.   There's one command that needs to be run in the Terminal. You can find Terminal in Applications/Utilities. Just... read more

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