Found the answer!
You just need to remove the Ripple Extension from your Google Chrome.
But after that I had another problem: For Cordova 3.3.0, you might face this weird error while emulating the camera or the photo/media library:
Uncaught TypeError: Failed to execute 'setAttribute' on 'Element': 2 arguments required, but only 1 present. -- ripple.js:49275
/incubator-ripple-master_new/pkg/hosted/ripple.js - line 49279
change this:
capture.setAttribute("controls");
to this:
capture.setAttribute("controls", true);
and then you can restart Ripple. BTW, for version 0.9.20, you don't need to provide the path to 'platforms/android/assets/www' anymore, just provide the root path and it will identify your project:
./ripple emulate --port 1234 --path ~/tech/phonegap/myPhonegapApp/