Examine source code of Retro Throbber Collection

{
  "manifest_version": 3,
  "name": "Retro Throbber Collection",
  "description": "Classic loading animations from the golden age of the web",
  "version": "1.0.6",
  "icons": {
    "16": "assets/logo/logo16.png",
    "48": "assets/logo/logo48.png",
    "128": "assets/logo/logo128.png"
  },
  "action": {
    "default_icon": "assets/logo/logo16.png",
    "default_popup": "popup/popup.html",
    "default_title": "Retro Throbber"
  },
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": true
  },
  "permissions": [
    "activeTab",
    "storage",
    "tabs",
    "alarms"
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "assets/throbbers/*/*/*/*/*",
        "assets/throbbers/*/throbber.json"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content/injector.js"
      ],
      "run_at": "document_start"
    }
  ],
  "background": {
    "scripts": [
      "background/worker.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "retro-throbber@eurisko.com.br",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}