Sorry, don't know Linpus but the generic instructions are:
- Download Firefox from the Firefox download page to your home directory.
- Open a Terminal and go to your home directory: cd ~
- Extract the contents of the downloaded file:tar xjf firefox-*.tar.bz2
- Close Firefox if it's open.
- To start Firefox, run the firefox script in the firefox folder.~/firefox/firefox
Firefox should now start. You can then create an icon on your desktop to run this command. Copied from:
Installing Firefox on Linux
A "global" installation (available to all users) is possible by installing as root user (a.k.a. super user) - the traditional location would be in /usr/local.
The disadvantage in a manual installation like this is you have to keep it updated manually - Linpus won't do it for you.