"problem loading"; "unable to connect"; "server not found" - ??

Been using Firefox 6 years with DSl. Recently have gotten nothing but the above messages - can't open any pages! Got a new DSL modem, re-downloaded Firefox and still can't open any pages - not even mozilla.com or google or cnn.
Rebooted, restarted, etc.
Even tried to download Chrome, but it failed - and I couldn't find out why because the "tell me why" defaulted to Firefox.
... really no fan of IE ...

Clear the cache and the cookies from sites that cause problems.
"Clear the Cache":
*Tools > Options > Advanced > Network > Cached Web Content: "Clear Now"
"Remove Cookies" from sites causing problems:
*Tools > Options > Privacy > Cookies: "Show Cookies"
See also:
*http://kb.mozillazine.org/Error_loading_websites
You can try to reset (power off/on) the router.
Another possible cause is security software (firewall,anti-virus) 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 and the plugin-container 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 and the updater process.
See:
*https://support.mozilla.org/kb/Server+not+found
*https://support.mozilla.org/kb/Firewalls

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