Examine source code of PDF Snatcher

{
  "manifest_version": 2,
  "name": "PDF Snatcher",
  "version": "2.0",
  "description": "Detects and downloads PDFs — even from restricted viewers.",
  "permissions": [
    "webRequest",
    "downloads",
    "storage",
    "tabs",
    "activeTab",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "content.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "PDF Snatcher"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "pdf-snatcher@local",
      "strict_min_version": "91.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}