Are Mozilla, and Mozilla Firefox different?

When looking at sitse they appear the same

[Llama]

Is the only difference between Mozilla and Mozilla Firefox their layout?

Or is it more than just skin deep?

[DrDoc]

Yes, they are essentially completely different. However, sites appear the same since they both use the Gecko rendering engine (which is why sites look the same in Netscape as well)...

[photon]

I believe that Mozilla has additional features like email, a news reader(?), etc., while Firefox is just a browser.

[bcolflesh]

texturizer.net/firefox/faq.html#q1.3

[elgumbo]

I've only recently started using firebird / firefox and don't think I can go back to IE. I just love the tabbed browsing too much :)