Here’s how to download and install standard Firefox:
Using Lenny’s Iceweasel browser (Menu > Internet > Iceweasel), download Firefox to your home directory. Let’s assume the name of the file you downloaded is “firefox-3.0.6.tar.bz2″ (the current version as of this writing).
Open up a terminal window and, as root, type the following commands (following each by hitting Enter):
apt-get remove iceweasel
mv firefox-3.0.6.tar.bz2 /usr/lib/
cd /usr/lib/
tar -jxvf firefox-3.0.6.tar.bz2
ln -s /usr/lib/firefox/firefox /usr/bin/firefox
You’ll also need a launch icon on the desktop. Create one using GNOME’s standard procedure, or simply save this file to the desktop.
Now, to make use of browser plugins that have already been set up by your Debian installation, you’ll want to create a symlink from /usr/lib/firefox/plugins/ to /usr/lib/mozilla/plugins/, using this pair of commands (as root):
rm -rf /usr/lib/firefox/plugins
ln -s /usr/lib/mozilla/plugins /usr/lib/firefox/plugins
Incidentally, on my installation, the default flash plugin that came with Lenny (flash-mozilla.so) required me to click a large play button (shown at right) each time I visited a web page that used flash.
To remedy this, I cruised over to Adobe’s flash plugin download page and downloaded Adobe’s flash plugin for debian, and then installed it with the command, “dpkg -i install_flash_player_10_linux.deb” (as root). That plugin (flashplugin-alternative.so) works much better.
