Error on apt-get Command!

[stumpy]

Since you only requested a single operation it is extremely likely that
the package is simply not installable and a bug report against
that package should be filed.
The following information may help to resolve the situation:
The following packages have unmet dependencies:
firefox: Depends: iceweasel (>= 2.0.0.6-0etch1+lenny1) but it is not going to be installed
Depends: iceweasel (< 2.0.0.6-0etch1+lenny1.1~) but it is not going to be installed
E: Broken packages

So that is what I get when I give this command:

apt-get install firefox

[rusty]

Try

apt-get update && apt-get -t unstable install iceweasel