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Social Media Monitor Extension

A white-labellable browser extension that allows you to analyse your facebook feed for targeted content.


The Contributor Browser Extension is available for the following browsers:

  • [Chrome] — url to be provided
  • [Firefox] — url to be provided

Once installed you must accept the standard terms and conditions of use. The extension will then begin to scan your facebook feed and youtube pages for ads, sponsored posts, and other targeted content and send that data in an anonymised manner to our servers for analysis.


branch status coverage notes
develop CircleCI codecov work in progress
master CircleCI codecov latest stable release


  • NodeJS, version 12.16.3 (LTS) (I use nvm to manage Node versions — brew install nvm.)

    Note: The browser extension will not build under Node 12.17.0 or higher.


There is currently an issue with one or more of the dependencies which means that to install you must run npm install and then

npm ci

instead of just npm install.

Continuous build environment (single machine)

Build the extension once:

npm run build

Build the extension continuously as you edit files:

npm run watch

Actual real-life development:

in two separate terminals, run these commands.

npm run chrome -- -- --env file=./nyu-build-config.js --env build=debug  --env config=std
npm run watch -- --env file=./nyu-build-config.js --env browser=chrome --env build=debug --env config=std

This starts a fresh Chrome install and also continuously monitors the code and recompiles it.

Build output

Both of the above scripts will generate eight output folders named in the format {browser}-{config}-{build}.

  • browser is one of firefox or chrome

  • config is one of std or qa

    • std configurations are intended for general users
    • qa configurations come with an additional analysis sidebar panel
  • build is one of release or debug.

    • release builds are minified and optimized
    • debug builds contain the source code and metadata for debuggers.

You can specify which browser, config, and build via command line params. For example to only build the chrome-std-debug version run:

npm run build -- --env browser=chrome --env config=std --env build=debug --env file=./nyu-build-config.js

To specify the correct backend to connect to, supply an --env api= param.

env api= backed api url
local http://localhost:7000

If you do not provide an --env api param it will default to process.env NODE_ENV, or if that's not available, local.

If you choose offline then it will only log the api server call but not actually attempt it.

Building a distributable extension

npm run build -- --env file=./build_file.js --env build=release --env config=std


You can create your own customised version of this extension by making a copy of the build-config.js and, optionally create a new assets folder, then, in your copy of build-config overwrite whatever information you wish.

So if, for example, you create your own build config called alt-build-config.js in the root folder of this project, then you'd use it by adding the param --env file=./alt-build-conf.

Any API URL you set in that file will be used as the default url, unless you specify an --env api option. The --env api option will override whatever you set in your copy of build-config.js.

Unit tests

Unit tests do not require a running backend server.

Run the unit tests:

npm test

Manual testing

If you made a big change that affects many parts of the extension, these are good things to test manually in the extension:

  1. fb scrolling feed, for 30+ posts, or about 5 ads
  2. fb messaging people
  3. liking fb group
  4. liking fb post
  5. clicking 3 dots on fb ad, it should show more info
  6. add friend

In general any normal facebook activity.

Please feel free to add to the list of things recommended to test, if you found one manual testing case that breaks it!

Repository organization

For a quick overview of the parts of a browser extension, visit:


Common utilities, located in src/common used by both the background script and the content scripts are found here. This includes interaction with local storage, UI utilities, various constants, and global stylesheet definitions.


The background script, located in /src/background, handle interaction with the API server, and maintain the extension's badge UI.


Content scripts are located in /src/content.

We don't use the content scripts to communicate with the backend server. Content scripts send relevant information to the background script which in turn interacts with the API server.

User Interface

UI elements are separate React apps located in /src/toolbar, and /src/webpage.


Messaging tools for the background scripts, content scripts, and UI elements are located in /src/messaging/.

Preload scripts

The preload script is loaded into Facebook prior to loading the HTML document, in order for the extension to programmatically click on the menu icon, to open the menu item "Why am I seeing this ad?"

The ytpreload script is loaded into YouTube prior to loading the HTML document, in order for the extension to intercept XHR requests correctly.


Please see the contributing notes and the code of conduct.


A browser extension to share data about your social feed with researchers and journalists to increase transparency.



Code of conduct





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