Is there anyway to extract the automatically detected proxy setting?

[1319987654321]

for example, in firefox.
coz mac doesn't seems to have similar setting under network...

 

[wrldwzrd89]

In Firefox this isn't terribly hard. The setting can be found, I believe, in your about:config page.

 

[1319987654321]

I searched thru it...
no luck

how does that work anyway?
why osx doesnt have such function built in?