After running a vanilla yo angularfire (aside from the package.json issue) bootstrap isn't being installed properly. When I grunt serve, the app fires, but the style is broken.
If I replace the bower-loaded bootstrap <script src> files with bootstrap from their CDN, it works fine.
Correction: Adding <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css"> to the <head> corrects the issue