The default installation of firefox may or may not be latest version. If you want to use latest version of firefox, then download firefox source ( i.e tar.gz ) files from this location.
Download the latest version of firefox releases from ftp site:
ftp://ftp.mozilla.org/pub/firefox/releases/
suppose if the firefox version is 3.5.6 then the file name is like firefox-3.5.6.tar.bz2 This file consists of firefox source files under "firefox" directory. Now we can copy...
