Examine source code of FocusBeast

{
  "manifest_version": 3,
  "name": "FocusBeast",
  "version": "1.0.0",
  "description": "Removes finally your procrastination",
  "browser_specific_settings": {
    "gecko": {
      "id": "muzay.contact@gmail.com"
    }
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": "Icons/Icon128.png"
  },
  "icons": {
    "16": "Icons/Icon16.png",
    "32": "Icons/Icon32.png",
    "48": "Icons/Icon48.png",
    "128": "Icons/Icon128.png"
  },
  "permissions": [
    "tabs",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "web_accessible_resources": [
    {
      "resources": [
        "Page/index.html"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ]
}