Examine source code of Shutup YouTube

{
  "name": "Shutup YouTube",
  "version": "1.2",
  "description": "Keep YouTubes opinions to itself.",
  "permissions": [
    "storage",
    "tabs",
    "*://youtube.com/*",
    "*://*.youtube.com/*"
  ],
  "page_action": {
    "show_matches": [
      "*://youtube.com/*",
      "*://*.youtube.com/*"
    ],
    "browser_style": true,
    "default_icon": {
      "48": "icons/logo-48.png",
      "96": "icons/logo-96.png"
    },
    "default_title": "Shutup Youtube",
    "default_popup": "settings/popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "settings/settings.html"
  },
  "icons": {
    "48": "icons/logo-48.png",
    "96": "icons/logo-96.png"
  },
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{552fa72d-5ed8-4fd6-ab87-7b8ddcf99b42}"
    }
  }
}