How do I fix a very slow Firefox browser often resulting in "Server Not Found"?

The browser is super slow, saying 'problem loading page' and ends up showing the 'Server not found' message. Eventually I'm able to access a website after highlighting the website address and hitting enter, maybe several times. My computer is new and have made minimal changes until this problem is resolved. Problem affects e-mail, too.

I think this is not a Firefox's bug/error.
This is I think generated from the back-end SQL syntax of the site, which means the site created this error message, not Firefox.
You may contact the site-owner and tell them about this error message, so they may know & fix this error.

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Hi, after installing WinXp Service Pack 3 Firefox no longer browses. I get Server not found.

All other computers on my local network connect
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Hi, ping works on any internet IP. Tried alternate pages, same problem.
All other machines on local network
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== This happened ==
Every time Firefox opened
== 3 - 4 weeks ago

Thanks for your help Moses but these Malware removal links are for Windows and I'm on Mac OS 10.4.9 on the laptop and 10.5.6 on the main machine.
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You either have an extension that causes that issue or some security software (firewall) is causing a delay.
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Firefox has always opened with an extra tab that says "server not found." How can I fix this?

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http://support.mozilla.com/en-US/kb/How+to+set+the+home+page

Every time I open Firefox and type in a URL, I get the message "Server not found. Firefox can't find the server at..." All I have to do is hit the "Try again" button and it finds it. However, this is getting tiresome. Any suggestions on how to fix this?

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How do I fix a very slow Firefox browser often resulting in "Server Not Found"?

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