As I said previously, it's only happening with my new laptop, and when I say new, I mean I got it only about a week ago.
My main pc is fine, my netbook is fine, and so is my phone. It appears that when I type in an address on my laptop, as distinct from clicking on a bookmarked site, a right pointing arrow appears at the right-hand end of the address bar, the place where you type in, and if having typed an address in I then click this arrow, it goes to and opens the site!
So I don't know what this arrow is about, it's running Firefox as is my PC and netbook.
David