The two key messages of this talk: (1) Mozilla and others have helped build an open, participatory web. It is a wonderful, amazing thing. However, technology alone may not be enough to preserve the web we’ve built. Everything from privacy and security to data portability in the cloud will represent serious challenges in the future. (2) The millions of people who use Firefox could get involved in responding to these challenges. Mozilla is in a better position than ever to reach out to millions of loyal supporters to (a) explain why an open web matters and (b) invite them to participate actively in making the web better.