Download audiobooks previews from audible.com webpage (that are publicly available free of charge)
Audible.com (as well as audible.de, audible.fr, etc.) webpage provides all users (with or without login) free samples of their audiobooks, which are usually 5 min long. The link to mp3 file of the sample is available on their webpage, but not directly visible to users. This extension adds a button to the page that points to this download link directly. Also, when a user visits several audiobook pages, those links are collected as the list of downloadable links that can be processed by user on their local machine later on.