Why chrome doesn't see plugins installed into /usr/local/lib/browser_plugins?

[Yuri]

On my system chrome has different set of plugins than firefox. Firefox 
has many more. It looks like chrome only picks them from 
~/.mozilla/plugins, while firefox also looks for them in 
/usr/local/lib/browser_plugins.
Some plugins only get installed into the latter directory, for ex. 
www/plugger installs /usr/local/lib/browser_plugins/plugger/npplugger.so 
and it doesn't appear in chrome at all unless one makes a symbolic link 
in ~/.mozilla/plugins.

So why chrome isn't looking in /usr/local/lib/browser_plugins?

Yuri