Examine source code of Code Self Study

{
  "manifest_version": 2,
  "name": "Code Self Study",
  "short_name": "codeselfstudy",
  "description": "A browser extension for Code Self Study (codeselfstudy.com)",
  "version": "0.9.1",
  "icons": {
    "64": "icons/icon.png"
  },
  "permissions": [
    "*://*.codeselfstudy.com/*",
    "activeTab"
  ],
  "background": {
    "scripts": [
      "vendor/browser-polyfill-0.8.0.js",
      "background_script.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "vendor/browser-polyfill-0.8.0.js",
        "content_script.js"
      ]
    }
  ],
  "browser_action": {
    "default_icon": {
      "64": "icons/icon.png"
    },
    "default_popup": "browserAction/index.html",
    "default_title": "Code Self Study"
  },
  "options_ui": {
    "page": "options/index.html"
  }
}