Examine source code of Remove DOM Elements

{
  "manifest_version": 3,
  "name": "Remove DOM Elements",
  "version": "1.0",
  "description": "Hover and click to remove elements from the page (Escape to exit)",
  "permissions": [
    "activeTab"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "action": {
    "default_title": "Pick element to remove"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "remove-dom-elements@example.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "icons": {
      "48": "48.png",
      "96": "96.png"
    }
  }
}