I was wondering if you can allow us to input our own custom icon sets instead of just the default 8. If you're worried about supporting many formats, you can just keep it the same as the formats you used for "Default Icon Set" or "KM7MK Icon Set". It'll be very useful in distinguishing different installations of firefox.
I'm a little noobish about this, but if you want me to test, I would be willing to help with that too. Thanks for writing such a wonderful program! You're awesome.