Examine source code of Zoom Image

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "version": "2.7.1",
  "homepage_url": "http://crossblade.her.jp/addon/ff_zoomimage/index.php",
  "icons": {
    "16": "icons/icon_16.png",
    "32": "icons/icon_32.png",
    "48": "icons/icon_48.png",
    "96": "icons/icon_96.png",
    "128": "icons/icon_128.png"
  },
  "applications": {
    "gecko": {
      "id": "{b14f4076-e80d-4baa-8c7d-8c65dfd2519c}",
      "strict_min_version": "57.0"
    }
  },
  "permissions": [
    "contextMenus",
    "activeTab",
    "storage"
  ],
  "background": {
    "scripts": [
      "default_setting.js",
      "background-script.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*",
        "file://*/*"
      ],
      "css": [
        "style.css"
      ],
      "js": [
        "jquery-3.1.1.slim.min.js",
        "content-script.js"
      ],
      "run_at": "document_end",
      "all_frames": true
    }
  ],
  "options_ui": {
    "page": "settings/options.html"
  },
  "default_locale": "en"
}