Examine source code of YTB Blocker

{
  "manifest_version": 2,
  "name": "YTB Blocker",
  "version": "2.0",
  "description": "YouTube channels blocker.",
  "icons": {
    "48": "icons/ytbblocker.svg",
    "96": "icons/ytbblocker.svg"
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/ytbblocker.svg",
      "32": "icons/ytbblocker.svg"
    },
    "default_title": "YTB Blocker"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "ytbblocker@elektrikis.id.lv"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "content.js"
      ],
      "all_frames": false
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "storage",
    "tabs"
  ]
}