Hello, I have OS X El Capitan 10.11.6, how do I update Safari.

If you're using a version of Safari older than 11.1.2, check for updates in the Mac App Store. Otherwise, upgrade the OS or switch browsers.

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Other browsers.

Firefox        10.9 or higher.     

Opera Browser        10.9 or higher.    

SeaMonkey      10.9 or higher8.     

Waterfox          10.8 or higher.