how to know the threads/shared libraries used by an application

Hi,

I was trying to see what are the shared libraries or threads created by youtube application. When I see /proc, I find that there is a directory corresponding to mozilla which has cmdline entry as
/bin/sh^@/usr/lib/firefox/run-mozilla.sh^@/usr/lib/firefox/firefox-bin^@
but I could not see any entry corresponding to youtube.Is the assumption Youtube is running as a thread in mozilla , correct?.Since thread is also a process, where is the entry for youtube.? Also youtube could be using multiple shared libraries/ threads. How Can I get that information.

Thanks for any help....

Youtube is not a program running on your system. Rather it is a webpage being displayed by mozilla. To answer your question, you can use the 'ldd' prgram to list the library dependencies of either binary programs or shared libraries. For example:
ldd /usr/lib/mozilla/mozilla-bin
libmozjs.so => not found
libplds4.so => /usr/lib/libplds4.so (0x4000c000)
libplc4.so => /usr/lib/libplc4.so (0x40010000)
libnspr4.so => /usr/lib/libnspr4.so (0x40015000)
libpthread.so.0 => /lib/libpthread.so.0 (0x40049000)
libdl.so.2 => /lib/libdl.so.2 (0x4167d000)
libgtk-1.2.so.0 => /usr/lib/libgtk-1.2.so.0 (0x4101a000)
libgdk-1.2.so.0 => /usr/lib/libgdk-1.2.so.0 (0x41534000)
libgmodule-1.2.so.0 => /usr/lib/libgmodule-1.2.so.0 (0x41683000)
libglib-1.2.so.0 => /usr/lib/libglib-1.2.so.0 (0x415ba000)
libXext.so.6 => /usr/X11R6/lib/libXext.so.6 (0x41657000)
libX11.so.6 => /usr/X11R6/lib/libX11.so.6 (0x413be000)
libm.so.6 => /lib/libm.so.6 (0x41595000)
libstdc++.so.5 => /usr/i486-slackware-linux/lib/libstdc++.so.5 (0x42019000)
libgcc_s.so.1 => /usr/lib/libgcc_s.so.1 (0x417c3000)
libc.so.6 => /lib/libc.so.6 (0x4116f000)
/lib/ld-linux.so.2 (0x41000000)

"lsof" might be another useful tool here...