Nether Portal Calculator for Minecraft

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Nether Portal Calculator for Minecraft",
  "short_name": "Nether Portal Calculator",
  "version": "1.0.1",
  "description": "Use this calculator to see where you should put your nether portals in Minecraft.",
  "permissions": [],
  "browser_action": {
    "default_popup": "popup/index.html",
    "default_title": "Nether Portal Calculator"
  },
  "web_accessible_resources": [
    "/popup/static/media/icon.27887bb5.png"
  ],
  "icons": {
    "128": "./assets/icon.png"
  },
  "content_scripts": [
    {
      "js": [
        "contentscript.js"
      ],
      "css": [
        "contentscript.css"
      ],
      "matches": [
        "*://*.youtube.com/*"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_security_policy": "script-src 'self' 'unsafe-eval' https://www.youtube.com https://s.ytimg.com 'sha256-V1N25PGzWFtiBP5GgU2aOUYyAquQhyzWWclSepyhv6s='; object-src 'self'"
}