I have a feeling dropins.js conflicts with mootools because I'm getting a Javascript error when trying to use Chooser.
The button is inserted using
document.getElementById("DBContainer").appendChild(button);
After I click the button the items are loaded, I can select them but clicking cancel or choose does nothing.
If I close the dropbox pop up window the cancel function still runs.
Uncaught TypeError: JSON.parse is not a function