Invalid URL's/Links in FF Browser on parallels side

I've noticed that when running my Firefox browser in the parallels/Windows7 side for some reason it appears to append a number to the destination URL/link when I click on something. If I navigate to parallels.com and click on "Products" FF jumps to parallels.com/products/_1 which invokes an error message due to the "_1" which it mysteriously appended. If I manually delete the _1 the link is fine.

However IE in parallels navigates correctly. Would this be a parallels issue or Firefox browser issue? FF, Safari, and IE all work fine on the mac side. Wondering what might cause this. Any thoughts? If this is a FF issue I will post my inquiry on the mozilla forum of course.
Thanks.
Eddie