Examine source code of HTTP Header Spy

{
  "name": "__MSG_extensionName__",
  "short_name": "__MSG_extensionNameShort__",
  "version": "2.0.49",
  "manifest_version": 2,
  "minimum_chrome_version": "18",
  "description": "__MSG_extensionDescription__",
  "author": "Michiel Roos",
  "homepage_url": "http://www.michielroos.com/",
  "default_locale": "en",
  "permissions": [
    "http://*/*",
    "https://*/*",
    "tabs",
    "activeTab",
    "storage",
    "webRequest"
  ],
  "background": {
    "scripts": [
      "Resources/JavaScript/library.js",
      "Resources/JavaScript/background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_icon": {
      "19": "Resources/Icons/toolbarIcon19.png",
      "38": "Resources/Icons/toolbarIcon38.png"
    },
    "default_title": "__MSG_extensionName__",
    "default_popup": "Resources/HTML/popup.html"
  },
  "icons": {
    "16": "Resources/Icons/icon16.png",
    "48": "Resources/Icons/icon48.png",
    "128": "Resources/Icons/icon128.png"
  },
  "oauth2": {
    "client_id": "344825410658-1hrj72o88dvpau57j8sdvhi6l01a8prg.apps.googleusercontent.com",
    "scopes": [
      "https://www.googleapis.com/auth/chromewebstore.readonly"
    ]
  },
  "options_ui": {
    "page": "Resources/HTML/options.html",
    "open_in_tab": false
  },
  "options_page": "Resources/HTML/options.html",
  "content_scripts": [
    {
      "js": [
        "Resources/JavaScript/Mark/mark.es6.min.js",
        "Resources/JavaScript/library.js",
        "Resources/JavaScript/content.js"
      ],
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "run_at": "document_idle"
    }
  ],
  "web_accessible_resources": [
    "Resources/HTML/plans.html",
    "Resources/HTML/thanks.html"
  ]
}