Won't connect to server, other browsers will

Firefox recently stopped working. Is unable to establish connection to server. Both internet explorer and safari still work but I don't like them as much as firefox. I tried removing firefox, downloading and reinstalling- no luck. I tried removing it from the firewall access list and then adding it back in-no luck. The computer came with Mcafee virus protection but the subscription expired about 6mo ago and it won't let me alter any settings it might have. I don't think this is the issue as firefox was working fine before. Checked the network connnection settings and same as the other browsers - auto detect proxy settings. Don't know what to try next. Couldn't find any more in your help section.

Are you running Mac OS X Server setup with Home directories on the Server, or just casual File Sharing off one Mac designated as the server?
Are all the Macs set up to get their IP addresses via DHCP?
Are the Macs that can't connect trying to use an address like 169.254.xxx.yyy ?
All wired to the same Router? Any using wireless connections instead of wired?
Can you use Network Utility to "Ping" the Router?
Can you use Network Utility to "Ping" the server?
Do you get an error message or just times out? What error message?

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