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A proof-of-concept implementation of ADPC in the browser


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ADPC prototype browser extension

This is a proof-of-concept implementation of the Advanced Data Protection Control (ADPC) mechanism, in the form of a browser extension. See the website,, for more information.

Try this extension

See for instructions to get it and try it out.

Developing this extension

To build or work on the code yourself, clone this repository then install the dependencies using yarn by running yarn install.

Run yarn build to bundle the code, or yarn dev to rebuild it continuosly while editing the source. Run yarn start to try run it in Firefox.

Code anatomy

This browser extension is written using TypeScript and Svelte, using Rollup to bundle the scripts, webextension-polyfill to support Chromium-based browsers, and a sprinkle of bootstrap to make it prettier.

The extension’s background script (src/background/) listens to all HTTP requests to detect whether a website would like to request the user’s consent via the HTTP header-based approach. The content script (src/content/) makes the JavaScript API available to every webpage at window.navigator.dataProtectionControl, and communicates with the background script’s functions using webextension-rpc.

The main user interface components are the pop-up (src/popup) and the ‘control centre’ (src/options). Because the extension is unable to open the pop-up by itself (without the user having triggered it), a work-around is used to show the pop-up as a pop-in, i.e. by adding an iframe in the corner of the web page that loads the content of the pop-up.

All storage is in the browser extension’s sync storage area, where every website has its own entry with storage data related to that site, e.g. would hold the consent requests and the user’s responses for Another entry in the storage is userPreferences.