mozilla/firefox extension version number?

[Viner, David]

Hi,

I'm trying to figure out how to determine the version of an installed
extension in both Firefox and Mozilla.  It appears that I can retrieve the
version in Firefox via:

try
    {
        var cExtMan =
Components.classes["@mozilla.org/extensions/manager;1"].getService(Component
s.interfaces.nsIExtensionManager);
        // try to grab our info
        // ID is a constant with my extension's guid
        var item =
cExtMan.getItemList(ID,Components.interfaces.nsIUpdateItem.TYPE_EXTENSION,
{});
        if(item && item[0])
            return item[0].version;
        else
            return 0;
    }
    catch(e)
    {
        return -1;
    }

but, this seems to fail in Mozilla.  

I've also tried:
        InstallTrigger.getVersion("/mozilla/yahootoolbar");

but this does not seem to reliably report the version installed and in use.

What's the right way for me to do this?

thanks
dave
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