Website links do not work (Firefox)

Somebody in my house used a UK website by the name of -

www.marksandspencers.com

This all relates to Firefox.

Now when they try and use this site something happens that I have never seen.

If they roll over the title on the left WOMEN you get a menu open that are links to all different areas of womens clothing, click on say Dresses, then you get taken to that section with more links.

Now the problem starts.

If you choose say - All Dresses - we get a blank page - If we then click in the Address window at the top then press return it goes to the page, under a mouse click it does not.

It is not the website, which works under other browsers, and seems to be only this one site, it used all work OK, it seems to be totaly Firefox related.

 

It was cookies, deleted the cookies to do with the website with the problems and all OK now.

I always but always forget how cookies can affect things online.