From MozillaZine, I learned that Firefox seems to use a different set of directories where it looks for plugins on different OSes.
This is quite annoying, as one always has to think first where to install a new plugin when working with different OSes. Note that I do not want to install it into my homedir, as I want other users of the same machine to be able to use the plugin as well.
Is there any simple way to find out in which directories firefox looks for plugins?