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cannot access internet after update

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I received an update to Firefox last week. Ever since, when I try to use Firefox to access the internet, I receive the following message: Unable to connect




         Firefox can't establish a connection to the server at www.facebook.com.
       



 The site could be temporarily unavailable or too busy. Try again in a few
   moments.
 If you are unable to load any pages, check your computer's network
   connection.
 If your computer or network is protected by a firewall or proxy, make sure
   that Firefox is permitted to access the Web.
I received an update to Firefox last week. Ever since, when I try to use Firefox to access the internet, I receive the following message: Unable to connect Firefox can't establish a connection to the server at www.facebook.com. The site could be temporarily unavailable or too busy. Try again in a few moments. If you are unable to load any pages, check your computer's network connection. If your computer or network is protected by a firewall or proxy, make sure that Firefox is permitted to access the Web.

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There is a troubleshooting article for this: Firefox cannot load websites but other programs can | Troubleshooting | Firefox Help. Does that help?