Examine source code of SubsFilter

{
  "manifest_version": 3,
  "name": "SubsFilter",
  "description": "An extension that filters YouTube recommendations based on your subscriptions",
  "version": "0.1.0",
  "action": {
    "default_icon": "img/icon_64.jpg",
    "default_title": "Unrecommender",
    "default_popup": "popup.html"
  },
  "host_permissions": [
    "*://*.youtube.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "js/jquery.min.js",
        "js/main.js"
      ],
      "run_at": "document_start"
    }
  ],
  "permissions": [
    "storage",
    "activeTab"
  ],
  "icons": {
    "64": "img/icon_64.jpg"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "8c34d069A5ef6A4679@8901Aabf1e8c5aa56"
    }
  }
}