Net Download Manager Browser Integration does not send any data to the developer or to any server. It only talks to the Net Download Manager app installed on the user's own computer (http://localhost and native messaging).

To send downloads to that app it reads, only when the user downloads: links and video/audio addresses on the current page (website content), the address and title of the current tab (web history), the user's clicks on the add-on's buttons and downloads started by the browser (user activity), and the cookies of the site being downloaded from. All of this goes only to the app on the same computer.

The developer does not collect, store, sell or share user data, does not use it for advertising or profiling, and the add-on loads no remote code. Settings are kept in the browser's local storage on the user's computer.

Full policy: https://github.com/PhKero/net-download-manager-extension/blob/main/PRIVACY.md
Contact: https://github.com/PhKero/net-download-manager/issues