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manifest.json

{
  "manifest_version": 2,
  "name": "Hero Thumb Downloader",
  "description": "This extension extract YT thumbnail and open in new tab",
  "version": "1.0",
  "action": {
    "default_icon": "icon.png"
  },
  "permissions": [
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.youtube.com/*"
      ],
      "js": [
        "contentScript.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{f5990902-347d-4591-9826-0f536fec3c9e}"
    }
  }
}