Examine source code of Page Load Sticker

{
  "manifest_version": 2,
  "name": "Page Load Sticker",
  "version": "1.0",
  "description": "When a page finishes loading, show a small animated sticker logo in the center for a few seconds.",
  "permissions": [
    "storage",
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "styles.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_action": {
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c536caae-0d72-495f-8973-c90638394a30}"
    }
  }
}