Examine source code of Image Blur Toggle

{
  "manifest_version": 2,
  "name": "Image Blur Toggle",
  "version": "1.0",
  "description": "Blur all images until hovered to reduce distraction or hide sensitive content.",
  "permissions": [
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "blur.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "imageblurtoggle@example.com"
    }
  }
}