I know it's "just" $9 , but I can't stop smiling. Over the last few weeks I've been building a Chrome extension for developers. There were days where I wondered if anyone would actually pay for something I made. Today, a complete stranger did. The money isn't what made me happy. It's the fact that someone I don't know looked at my product and thought, "Yeah, this is worth paying for." That feeling is hard to describe. It's also a reminder that every bug fix, l...