This should work on other similar systems.
su or login as root first.
# wget http://ftp.mozilla.org/pub/mozilla.org/firefox/releases/1.5b1/linux-i686/en-US/firefox-1.5b1.tar.gz # cd /usr/lib # tar xzvf ~/firefox-1.5b1.tar.gz # mv firefox firefox-1.5b1 # which firefox /usr/bin/firefox # cd /usr/bin/ # mv firefox old.firefox # ln -s /usr/lib/firefox-1.5b1/firefox .
That should do it, and shouldn't affect any of your launchers or file associations.
[update] It appears that you may need the compat libs for this to work. If you use a package manager, search for 'compat' and you should find something like compat-libstdc++ or libstdc++-compat. If you install them FF should be happy.