Examine source code of Kahoot-Keys

{
  "manifest_version": 2,
  "name": "Kahoot-Keys",
  "description": "Bind the Kahoot buttons to keys",
  "version": "0.4resigned1",
  "icons": {
    "16": "icons/icon16.png",
    "38": "icons/icon38.png",
    "64": "icons/icon64.png",
    "128": "icons/icon128.png"
  },
  "browser_action": {
    "default_icon": "icons/icon.png",
    "default_popup": "options/options.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://kahoot.it/*"
      ],
      "js": [
        "lib/arrive.min.js",
        "lib/log.min.js",
        "inject.js"
      ],
      "all_frames": true,
      "match_about_blank": true
    }
  ],
  "permissions": [
    "https://kahoot.it/*",
    "*://*/*",
    "storage",
    "tabs"
  ],
  "background": {
    "scripts": [
      "hot-reload.js"
    ]
  },
  "options_ui": {
    "page": "options/options.html",
    "chrome_style": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{fcfdc667-ef1c-4a4a-80b2-59f60c32c7b6}"
    }
  }
}