Examine source code of YouTubeMeow

{
  "applications": {
    "gecko": {
      "id": "youtubemeow@kan.onl"
    }
  },
  "author": "Kanon Lo",
  "background": {
    "scripts": [
      "assets/js/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.google.com/search*"
      ],
      "js": [
        "assets/js/content_scripts.google.js"
      ]
    },
    {
      "matches": [
        "*://www.bing.com/search*"
      ],
      "js": [
        "assets/js/content_scripts.bing.js"
      ]
    },
    {
      "matches": [
        "*://duckduckgo.com/*"
      ],
      "js": [
        "assets/js/content_scripts.duckduckgo.js"
      ]
    }
  ],
  "description": "Adds a YouTube link on the Google, Bing, & DuckDuckGo search results page and YouTube search by right-click.",
  "icons": {
    "16": "assets/images/icon-16.png",
    "32": "assets/images/icon-32.png",
    "48": "assets/images/icon-48.png",
    "96": "assets/images/icon-96.png",
    "128": "assets/images/icon-128.png"
  },
  "manifest_version": 2,
  "name": "YouTubeMeow",
  "options_ui": {
    "page": "assets/views/options.html"
  },
  "permissions": [
    "menus"
  ],
  "version": "0.0.104"
}