Problem with pre?erences

HI!
I have following problem. I need to get preferences of current profile:
c:\Documents and Settings\[Windows Login Name]\Application
Data\Mozilla\Profiles\[profile name]\[random string].slt\ prefs.js

Here is the code I wrote:


NS_InitEmbedding(nsnull, nsnull);

nsCOMPtr<nsIPrefService> prefService =
                     do_GetService(NS_PREFSERVICE_CONTRACTID);

if(prefService)
{
        nsCOMPtr<nsIPrefBranch> prefBranch;
        rv =
prefService->GetBranch("network.proxy.",getter_AddRefs(prefBranch));
        if(NS_SUCCEEDED(rv))
        {
                char* sStr;
                rv = prefBranch->GetCharPref("http", &sStr);
        }
        else {...}
}
else {...}

This code return preferences from C:\program
files\Netscape\defaults\pref\all.js
but these preferences are not of current profile.
I've no idea what to do.