Error message - Unable to find proxy server - how can I solve this problem

When I try to enter some sites I get the error message: Unable to find the proxy server, Firefox is configured to use a proxy server that can't be found. This happened suddenly and I'm not sure why or how I can fix it, it doesn't help that most help site are blocked. Im using a Mac 10.5.8 and Firefox 15.

You can check the connection settings.
*Firefox > Preferences > Advanced > Network : Connection > Settings
*https://support.mozilla.org/kb/Options+window+-+Advanced+panel
If you do not need to use a proxy to connect to internet then try to select "No Proxy" if "Use the system proxy settings" or one of the others do not work properly.
See "Firefox connection settings":
*https://support.mozilla.org/kb/Firefox+cannot+load+websites+but+other+programs+can

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