I was reading about Firefox 2 over on the mozilla.org wiki. And saw that it is code named Bon Echo, here is a clip from the wiki that explains:
About Bon Echo
Continuing the tradition, Firefox 2 will use a pre-release code name taken from a public park. Bon Echo Provincial Park is located in Ontario, Canada. The name literally translates to "good echo", and reflects how it is our goal echoes that of Firefox 1, once again focusing on improving the browsing experience for our users, making it simple, effective, fast and useful.
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