Nor are there spaces between the three lines that compose the address. On Firefox, it looks like I was a blank line in between each of them, which I don't.
It's because there is a paragraph tag enclosing each one (inside of the TD tag). Take out that and the space disappears.
I have to say that, from my experience, Firefox does some stupid things, but it works a lot harder to adhere to the W3C standards. By the way, you can check your page for standards compliance here:http://validator.w3.org/