Snowpine, here is the output when I run it from the terminal window as directed in post#3. Does this give us useful info for solving the matter?

Code:
swarup@swarup-laptop:~$ cd /home/swarup/Desktop/firefox 
swarup@swarup-laptop:~/Desktop/firefox$ ./firefox
XPCOMGlueLoad error for file /home/swarup/Desktop/firefox/libxpcom.so:
libxul.so: cannot open shared object file: No such file or directory
Couldn't load XPCOM.
swarup@swarup-laptop:~/Desktop/firefox$