A later libstdc++.so.6 : version "gcc-4.3.2" will do : libstdc++6-4.3.2-1.i386.rpm
The package provides /usr/local/c++4.3/ libstdc++.so.6 libstdc++.so.6.0.10
(The EL5 system libstdc++.so.6 in /usr/lib/ is too old.
And should not be replaced, I think.)
libstdc++6-4.3.2-1.i386.rpm can be downloaded here
https://docs.google.com/uc?id=0B7S25...nload&hl=en_US
.. And firefox-5.0.1 will start OK with this command :
cd firefox/ && export LD_LIBRARY_PATH=/usr/local/c++4.3:/usr/lib:/lib && ./firefox
The "export line" can also be added to the 'firefox' start script, line 52.
Then the start command is plain ./firefox
..