1.3 What's the difference between Phoenix and Mozilla?
Mozilla is a complete suite of web related applications, such as a browser, a mail/news client, a chat client and much more. Phoenix is just a browser, which makes it a better choice if you already have a mail client for example. Also, since Phoenix is smaller than the whole Mozilla suite, it's also faster and easier to use.
Note, though, that Phoenix is not just the standalone Mozilla browser. The user interface in Phoenix differs from Mozilla in many ways. For example, Phoenix has customizable toolbars.
Phoenix is just Mozilla with a couple UI tweaks.
The 31,000+ lines of code already added or changed from Mozilla beg to differ. People who claim this are generally unknowledgeable about Phoenix.