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?

This is an ongoing issue.

A possible cause is security software (firewall) that blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program.
Remove all rules for Firefox from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox and the plugin-container process.
See:
* https://support.mozilla.com/kb/Server+not+found
* https://support.mozilla.com/kb/Firewalls

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