retrieveDevTwitterUserCredentials.js well tested
adding Twitter handle guessing module
API change for lib/retrieveDevTwitterUserCredentials.js: since the username is provided, a single credentials entry can be returned
it's all coming together. Bug related to addon not working when the computer is offline when Firefox is first launched fixed in getReadyForTwitterProfilePages refactoring. Also: https://www.youtube.com/watch?v=6y1aOg_UO_A