Examine source code of Focused YouTube

{
  "manifest_version": 2,
  "name": "Focused Youtube",
  "version": "9",
  "homepage_url": "https://github.com/dukevin/FocusedYoutube",
  "description": "Remove video suggestions and distractions from Youtube",
  "icons": {
    "48": "icons/FocusedYoutube-48.png",
    "96": "icons/FocusedYoutube-96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "css": [
        "style.css"
      ],
      "js": [
        "FocusedYoutube.js"
      ]
    }
  ],
  "options_ui": {
    "page": "options.html"
  },
  "permissions": [
    "storage"
  ],
  "applications": {
    "gecko": {
      "id": "FocusedYoutube@dukevin.com"
    }
  }
}