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Remove /usr/bin/firefox. It's the Firefox 1.5 executable. The sudo command allows you to do this as root, because only root has write access to /usr/bin. You could always do this instead:
(enter your root password to become root)
# rm /usr/bin/firefox
# ln -s /path/to/new/firefox/binary /usr/bin/
You need to link it instead of moving it because the Firefox 2.0 binary expects all its libraries to be at a certain place relative to its location (the proper directory structure is self-contained inside the decompressed folder you downloaded). Linking the binary to /usr/bin allows you to preserve the hierarchy, whereas moving it does not. Make sure that the firefox folder is in a place that's unlikely to change before doing the link, because moving the folder after linking firefox to /usr/bin will break it.
Personally I would have just left things as they were without deleting the old binary. If you installed firefox 2.x into /usr/local/firefox and you want it to be the default browser, then all you would need to do is edit the list of preferred applications in gnome (System -> Preferences -> Preferred Applications) or KDE (Kcontrol -> Components -> Components chooser -> Web browser) and make /usr/local/firefox/firefox the default browser. You probably would also need to edit your existing Firefox menu entries or desktop shortcuts and change the Firefox command to /usr/local/firefox/firefox.