Examine source code of Nutrition Labels for News

{
  "manifest_version": 2,
  "name": "Nutrition Labels for News",
  "description": "Nutrition Labels for News",
  "version": "2021.3.5.1",
  "browser_action": {
    "default_icon": "images/logo-32.png"
  },
  "icons": {
    "16": "images/logo-16.png",
    "32": "images/logo-32.png",
    "64": "images/logo-64.png",
    "128": "images/logo-128.png"
  },
  "background": {
    "scripts": [
      "assets/jquery.js",
      "csp.js",
      "activator.js",
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "run_at": "document_start",
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "assets/jquery.js",
        "pagewarning.js"
      ]
    },
    {
      "run_at": "document_end",
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "assets/jquery.js",
        "content.js"
      ],
      "css": [
        "assets/grid.css",
        "assets/common.css"
      ]
    }
  ],
  "permissions": [
    "tabs",
    "storage",
    "<all_urls>",
    "webRequest",
    "webRequestBlocking",
    "management"
  ],
  "web_accessible_resources": [
    "webRequest",
    "background",
    "assets/*",
    "images/*",
    "pagelevel.js",
    "content.html"
  ]
}