I'm sorry, Peter, but I did try to couch my statements appropriately.
I thought Firefox was GPL, so since you were distributing it you would have to make sources available under those terms. Are you meaning that you could charge for the binary, or a reasonable price for the source (whatever that may mean)?
Alternatively, I see now that I have looked in to it that it has several licences. Are you now using the "Mozilla Public License", which <a href="[link]">permits, in limited ways, proprietary, derivative works</a>?
Your web-page says: "Whilst there is no real problem with selling Firefox as a product, once it is available to someone, they are free to distribute it as they wish." Since you took money to develop Firefox, you'd have to give it to them, and presumably they could then distribute it for free or sell it?
In any case, this is a digression. It looks like many people want to know how they can help, or what needs to be done. Please answer them.