I have to use the old FC6 instead of the latest Fedora distro.
The existing thunderbird 1.5.0.12-3 is working fine.
I want to upgrade thunderbird to the latest version.
How to do that?
This is my procedure.
I downloaded thunderbird-2.0.0.19.tar.gz and untar it to /usr/local/bin/thunderbird.

$ /usr/local/bin/thunderbird/thunderbird
/usr/local/bin/thunderbird/thunderbird-bin: error while loading shared libraries: libstdc++.so.5: cannot open shared object file: No such file or directory

# rpm -qa libstdc++
libstdc++-4.1.1-30

How do I install libstdc++.so.5 for only thunderbird so that libstdc++-4.1.1-30 is still the default?

libstdc++.so.5 is provided from compat-libstdc++-33, so you can have both libraries at the same time.

libstdc++.so.5 is installed now.

$ /usr/local/bin/thunderbird/thunderbird-bin
/usr/local/bin/thunderbird/thunderbird-bin: error while loading shared libraries: libmozjs.so: cannot open shared object file: No such file or directory

I google but did not find anything useful.

You should not use thunderbird-bin to start thunderbird. Instead use the shell script thunderbird (that is /usr/local/bin/thunderbird/thunderbird in your case).
BTW the missing library is in the same directory where you've installed thunderbird.

Regards

You are right.
It should be
/usr/local/bin/thunderbird/thunderbird
Thanks.

you need this one :
compat-libstdc++-33-3.2.3-61.i386.rpm
or
#yum install compat-libstdc++