I know that I can hide all extensions but how do I hide just one, say
webloc? I don't want to hide each the extension of each file individually.
The only thing I could find, suggested by Benjamin Schollnick, here., is this:
It will hide the extension for existing files, therefore, you will need to run it again for newly created files.
Althought in the original question its said for Leopard, I guess it will work for Lion too.