Installing Firefox on Debian is not that trivial. Has to do with the conflict between Debian team and Mozilla, I guess. Anyways, Debian replaced Firefox with iceweasel. To install Firefox some manual work, libxul, libasound2, libdbus might be needed

Software:

Debian Lenny (5.0.3)

Should also work for:

Some other Debian distros

1

Get Firefox

wget -O firefox.tar.gz2 "http://download.mozilla.org/?product=firefox-3.5.9&os=linux&lang=en-US";tar -vxjf firefox.tar.gz2

2

What do we miss?

Try:

>firefox --version

 
If it needs libxul (will also load shared objects):

1
2
3

sudo apt-get --force-yes --yes install xulrunner-1.9
echo "/usr/lib/xulrunner-1.9/">>/etc/ld.so.conf
ldconfig

 
To get libasound:

sudo apt-get --force-yes --yes install libasound2

 
For libdbus:

sudo apt-get --force-yes --yes install libdbus-glib-1-2

 
Should work now! Let me know if I missed something.

Have fun!