When you click the addon's toolbar button, it sends the URL of the current tab you are viewing to our web service. We then make a separate request for the content using the URL submitted.
The addon only acts when you click the toolbar button. Article processing and ebook creation happens on our servers. The result is emailed to your Amazon account via the Kindle email address you provide. We do not store or analyse content users send, except for cached copies of articles which are not linked to email addresses and are deleted within hours.