Thanks for the feedback. Not being able to hide the icon is an issue we're working on. It should be fixed in the next release.
As for the email address not being saved, please check the following:
* Ensure local storage (an HTML5 feature) is enabled - it should be by default. We use it to save the email address. See http://stackoverflow.com/a/7358969/407938 to check whether it's enabled or not.
Let us know if you still have trouble.