That new Firefox version should be 6.0.1 not 6.0.10.

That is most likely being caused by a recently discovered problem where SSL security certificates from an issuer in the Netherlands were found to be invalid. Firefox (and other browser developers) is currently taking measures to protect its users against the fraudulent certificates (your link mozilla.snt.utwente.nl is located in the Netherlands). Try your download again and hopefully you will be directed to one of the other download mirrors around the planet.

• Download mirrors: http://www.mozilla.org/community/mirrors.html

You can also download the full installer, SAVE the download to your Desktop, then close Firefox and run the installer if you wish:

• https://www.mozilla.org/en-US/firefox/all.html

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Not related to your question, but...

You need to update some plug-ins:

• Plug-in check: https://www-trunk.stage.mozilla.com/en-US/plugincheck/
• Next Generation Java Plug-in for Mozilla browsers: Installing or Updating Java in Firefox

This has not helped at all as when I try as you say I still get the same message and do not want to end up with a virus. Please can you tell me how to download this safe.

"Mirror" means official partner-site. If a site is on the mirror list that means that they are an official partner of Mozilla and they have permission to distribute Firefox. In this case you are sent to the University of Twente, which is on the mirror list, so the download should be safe. If you download from a site that is not on the mirror list then you are not safe and you must cancel the download.

Many of these mirrors help host for a variety of open source projects including Mozilla and various Linux distributions. If you tried again you would likely be directed to another of the mirrors.

The http://mozilla.snt.utwente.nl/ example you gave is one of the primary mirrors used to help load balance the releases.mozilla.org as mentioned on http://www.mozilla.org/community/mirrors.html as Mozilla would not be able to handle the load themselves, especially during multiple new Major version releases of Firefox, Thunderbird and SeaMonkey.

The one you thought was not safe was a University.

Europe
University of Twente - SNT (nl) http://mozilla.snt.utwente.nl/

I agree that since it was .nl it could have been related to DigiNotar root certificate recently. http://www.mozilla.org/security/announce/2011/mfsa2011-34.html

Going directly to http://mozilla.snt.utwente.nl/ , I do not receive a warning. Going directly to that link, takes you to an index of what is available and does not start an immediate download.

Is the Date/Time on your system correct?

• Incorrect Date/Time on your system when compared to the issue and/or expiration dates on a security certificate can cause you to receive an error.
• To check your computer's Date/Time settings in XP,
  • right click the Date/Time displayed in the lower right corner (right end of the Windows task bar, and choose "Adjust Date/Time".
  • You can also access that same function by using Windows Start button > Settings > Control Panel > Date and Time.
• If your system is not "holding" the correct Date/Time after changing it, the battery on your motherboard may need to be replaced.

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