I am sure you realized by now that you didn't download Firefox's source code, but the binary version.
There is really nothing to install, just execute the file "firefox" in the firefox directory.
As Smolloy said, you can always use apt-get to install it as well: Code: apt-get install firefox
More here: Techno Wizah: Debian HOW-TO : Update Firefox
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"To express yourself in freedom, you must die to everything of yesterday. From the 'old', you derive security; from the 'new', you gain the flow."
-Bruce Lee
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