Examine source code of ytTREX

{
  "manifest_version": 2,
  "name": "youtube.tracking.exposed",
  "short_name": "ytTREX",
  "description": "A tool for academic researchers. Part of the tracking.exposed project, is meant to analyze the algorithm of a popular video portal.",
  "version": "2.7.0",
  "author": "the Tracking Exposed team",
  "icons": {
    "16": "yttrex16.png",
    "48": "yttrex48.png",
    "128": "yttrex128.png"
  },
  "browser_action": {
    "default_icon": "yttrex16.png",
    "default_popup": "popup.html"
  },
  "permissions": [
    "storage",
    "https://*.youtube.com/",
    "https://youtube.tracking.exposed/"
  ],
  "background": {
    "scripts": [
      "./background.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.youtube.com/*"
      ],
      "js": [
        "./app.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "*.png",
    "settings.json",
    "experiment/name.json",
    "experiment/*.csv"
  ],
  "cross_origin_embedder_policy": {
    "value": "require-corp"
  },
  "cross_origin_opener_policy": {
    "value": "same-origin"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{5b6dbdc4-2243-4100-a384-a8847c7c5c40}"
    }
  }
}