You open your Google Form, click the add-on icon, choose Formfacade - Embed Google Forms™, and the menu shows only Help. Embed in a webpage and Customize this form are missing, so it looks as if the add-on has stopped working, and some people install it again. Nothing is wrong with the add-on: the menu opened before your Google Form finished loading. Let the form load fully, then open the add-on menu again.
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