> tar -xf firefox-19.0.tar.bz2

> cd firefox/

> ls
application.ini             dictionaries      libnss3.so       libssl3.so              run-mozilla.sh
blocklist.xml               extensions        libnssckbi.so    libxpcom.so             searchplugins
chrome                      firefox           libnssdbm3.chk   libxul.so               Throbber-small.gif
chrome.manifest             firefox-bin       libnssdbm3.so    modules                 updater
components                  icons             libnssutil3.so   mozilla-xremote-client  updater.ini
crashreporter               libfreebl3.chk    libplc4.so       omni.ja                 update-settings.ini
crashreporter.ini           libfreebl3.so     libplds4.so      platform.ini            webapprt
crashreporter-override.ini  libmozalloc.so    libsmime3.so     plugin-container        webapprt-stub
defaults                    libmozsqlite3.so  libsoftokn3.chk  precomplete
dependentlibs.list          libnspr4.so       libsoftokn3.so   removed-files

> ./firefox
XPCOMGlueLoad error for file /home/dir/firefox/libxpcom.so:
libxul.so: cannot open shared object file: No such file or directory
Couldn't load XPCOM.

> file libxul.so 
libxul.so: ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, stripped

> locate libxul.so 
/usr/lib64/xulrunner-2.0b12/libxul.so

> sudo cp /usr/lib64/xulrunner-2.0b12/libxul.so /usr/lib/

> ./firefox
XPCOMGlueLoad error for file /home/dir/firefox/libxpcom.so:
libxul.so: wrong ELF class: ELFCLASS64
Couldn't load XPCOM.