Firefox was working fine and suddenly it could not access the proxy server; I deleted the program, downloaded and re-installed. same problem - what gives?

I have Opera, internet explorer, and safari on my pc. they are still fully functional buy firefox has become unable to connect

You can find the connection settings in Tools > Options > Advanced : Network : Connection
If you do not need to use a proxy to connect to internet then select "No Proxy"
See "Firefox connection settings":

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