You can ignore that pop-up (tooltip).

See How do I tell if my connection to a website is secure?

What kind of problem do you have? --- "Clear the Cache": Tools > Options > Advanced > Network > Offline Storage (Cache): "Clear Now" "Remove the Cookies" from sites that cause problems: Tools > Options > Privacy > Cookies: "Show Cookies"

Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of your add-ons is causing your problem (switch to the DEFAULT theme: Tools > Add-ons > Themes). See Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems and Troubleshoot issues with plugins like Flash or Java to fix common Firefox problems

the problem is still not solved

Can you tell us what problem that you have?

I was loading a website, it then stated as below, it wasnt any of the problems stated below.

SERVER NOT FOUND

1. Check the address for typing errors such as

   ww.example.com instead of
   www.example.com

1. If you are unable to load any pages, check your computer's network

   connection.

1. If your computer or network is protected by a firewall or proxy, make sure

   that Firefox is permitted to access the Web.

Thus i checked the Page Info, it states that:

Security Info on page: This website does not supply ownership information. Connection not Encrypted.

Technical Details: The website does not support encryption for the page you are viewing. Information sent over the internet withour encryption can be seen by other people while it is in transit

A possible cause is security software (firewall) that blocks or restricts Firefox without informing you about that, maybe 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.

See Configure firewalls so that Firefox can access the Internet and http://kb.mozillazine.org/Firewalls

http://kb.mozillazine.org/Firewalls

the website does not load. Error.

Use the Google cache in case of problems accessing the MozillaZine KB http://www.google.com/search?hl=en&ie=UTF-8&q=cache:http://kb.mozillazine.org/Firewalls