I have an idea for an application, because the application will involve connecting to the internet I am thinking that XPCOM might be the right fit. Currently I am learning C++ and I understand this the basis for how you program with XPCOM. What I would like to know is, if you do develop an application with Mozilla technologies like XPCOM can they be commercial (paid) solutions. Can you sell them for a profit, or do they have to be Open Source? Thanks