The "nightly builds" are what can break your current installation of Firefox. This just gets whatever current version changes for all of us BLEEDING EDGE TYPES. Yes, I lost the ablity to install plugins. Of course I did because I was updating the browser point by point.

Does the app work? YES
Can you break your browser by downloading unstable builds? YES
Are you an idiot for complaining? mmmmm, read between the lines.

Grade the app not the nightly builds and stop acting like PC heads MAC people!

Let's transition into the MacTel era with some pride and continue to use the grey matter.