Examine source code of OpenRussian Dictionary

{
  "manifest_version": 2,
  "name": "OpenRussian Dictionary",
  "version": "1.0",
  "description": "Look up Russian words on OpenRussian.org",
  "icons": {
    "192": "icon-192x192.png"
  },
  "permissions": [
    "contextMenus",
    "activeTab",
    "tabs"
  ],
  "background": {
    "scripts": [
      "openrussian-dictionary.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{af56ea34-2cda-485e-880c-dcaa800f03e5}"
    }
  }
}