Examine source code of Video Progress

{
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "version": "1.2.0",
  "manifest_version": 2,
  "default_locale": "en",
  "icons": {
    "16": "assets/images/icon16.png",
    "32": "assets/images/icon32.png",
    "48": "assets/images/icon48.png",
    "128": "assets/images/icon128.png"
  },
  "background": {
    "page": "pages/background/background.html",
    "persistent": true
  },
  "permissions": [
    "<all_urls>",
    "storage"
  ],
  "browser_action": {
    "default_title": "Privacy Redirect",
    "default_popup": "pages/popup/popup.html",
    "default_icon": {
      "16": "assets/images/icon16.png",
      "32": "assets/images/icon32.png",
      "48": "assets/images/icon48.png",
      "128": "assets/images/icon128.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "pages/content/getVideoElements.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "assets/javascripts/helpers/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "addmefsdon@example.com",
      "strict_min_version": "42.0"
    }
  }
}