Originally Posted by Instantly
./firefox-bin: error while loading shared libraries: libstdc++.so.5: cannot open shared object file: No such file or directory
what should I do?
Well if you posted a distro on your profile (left hand side box) then someone might be able to tell you how to install it without having all of the stresses of "faffing about" with source files.
Theres a good chance that it's available from the software manager of your distro - except if we don't know what the distro is, we can direct you towards it.
The software manager would (probably) have known that it requires the libstdc++.so.5 as a dependency and installed it for you.