This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

ابحث في الدعم

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Why won't Firefox work on OSX Sierra?

  • 2 (ردّان اثنان)
  • 2 have this problem
  • 8 views
  • آخر ردّ كتبه Speedy404

more options

Upgraded my Mac Mini with the latest Sierra OS, version 10.12.6. Downloaded the latest version of Firefox, 54.0.1. All I get is "unable to connect" message. Won't go anywhere. Safari works fine, Internet is fine, what's the deal??? Thanks for any help.

Upgraded my Mac Mini with the latest Sierra OS, version 10.12.6. Downloaded the latest version of Firefox, 54.0.1. All I get is "unable to connect" message. Won't go anywhere. Safari works fine, Internet is fine, what's the deal??? Thanks for any help.

All Replies (2)

more options

You might have inadvertently setup some proxy connections in Firefox. Check Advanced/Network/Connection and make sure No Proxy is selected.

more options

Thanks but that didn't work. All I ever did was upgrade to Sierra, then a lot of things didn't work anymore. Will take to the Apple store.