Examine source code of Retail Benefits

{
  "manifest_version": 2,
  "name": "Retail Benefits",
  "short_name": "retailbenefits",
  "description": "Get alerts from the Shopping Assistant at merchant sites and never miss rewards again!",
  "author": "Retail Benefits",
  "homepage_url": "https://shop.retailbenefits.com",
  "version": "5.1.0",
  "background": {
    "scripts": [
      "js/browser-polyfill.min.js",
      "js/background.js"
    ]
  },
  "icons": {
    "16": "img/app-icon-16.png",
    "48": "img/app-icon-48.png",
    "128": "img/app-icon-128.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "19": "img/icon-19-default-color.png",
      "38": "img/icon-38-default-color.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "js/browser-polyfill.min.js",
        "js/content.js"
      ],
      "css": [
        "css/content.css"
      ]
    }
  ],
  "permissions": [
    "<all_urls>",
    "alarms",
    "webNavigation",
    "webRequest",
    "storage",
    "cookies"
  ],
  "web_accessible_resources": [
    "img/facebook.png",
    "img/google.png",
    "img/icon.png",
    "img/logo.png"
  ],
  "applications": {
    "gecko": {
      "id": "toolbar@retailbenefits-4",
      "strict_min_version": "58.0"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "data_collection_permissions": {
        "required": [
          "websiteContent",
          "websiteActivity",
          "browsingActivity",
          "locationInfo"
        ]
      },
      "id": "toolbar@retailbenefits-4_new"
    }
  }
}