With - http://keepn.com/ - I get a 4o4 message from the server. Not Found

With - www.kvisit.com - I get re-directed here - http://www.keepandshare.com/

Exactly what is the message you are getting?
Can you post a screen shot of that message?

https://support.mozilla.com/en-US/kb/Adding+screenshots

Yes, keepandshare.com is the parent site but apparantly needs the other two to run their programmes - Have uploaded an image. Hope it helps. Thanks so much!

var checkDomains = new Array(
	"www.keepandshare.com",
	"keepn.com",
	"kvisit.com"
);

checkDomains.each(function(domain) {
	var domainid = "domain" + domain.replace(RegExp('/\./g'), '_');
	var element = new Element('li', { id: domainid, "class": "checking" });
	element.insert(domain);
	$('domainslist').insert(element);
});

It looks that a script tries to access those three domains and waits for 5 seconds for a response.

• "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 Use Troubleshoot Mode in Firefox 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

Also make sure that your security software isn't blocking those domains or cause extra delays.

Thanks so much! It worked... And now I know how to clear these cookies... Have a good day