getVersion()

Hi,

I have some problems with getVersion() because it returns null. I looked 
in mozver.dat and the add-ons are listed with the correct version info, 
so I don't know what to look for next. Do you have a tip for me?

I have several mozilla directories with the same add-ons installed so 
there are multiple entries for each add-on, can this be causing this?

What should/can I use for testing i.e. what should *not* return null for 
a default mozilla installation, if any.

Thanks,
/HJ