Examine source code of Open ISBN

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "short_name": "__MSG_extensionShortName__",
  "description": "__MSG_extensionDescription__",
  "author": "Brett Zamir",
  "version": "0.3.1resigned1",
  "homepage_url": "https://github.com/brettz9/open-isbn/",
  "permissions": [
    "contextMenus",
    "storage",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "polyfills/browser-polyfill.min.js",
      "lib/background.js"
    ]
  },
  "options_ui": {
    "page": "options/options.html",
    "browser_style": true,
    "chrome_style": true,
    "open_in_tab": false
  },
  "icons": {
    "128": "icon.png"
  },
  "default_locale": "en",
  "applications": {
    "gecko": {
      "id": "jid0-AUMeALWAI9Z08xdCmXfcfeySIjk@jetpack"
    }
  }
}