Spent like 10 minutes on this one, mainly just 'shopping the background out of the logo. Just right click on the 'temp logo, click "Save link as" then drag it into Chrome once it's done downloading. It has to be that way, or you'll get an error saying "Apps must be served with content type application/x-chrome-extension". Reason It's just that way, if it's not hosted on a server with special HTTP headers. Obviously, dropbox doesn't.