Examine source code of Website Safety Checker

{
  "manifest_version": 2,
  "name": "Website Safety Checker",
  "description": "Check websites against a safety service before navigation",
  "version": "1.1",
  "icons": {
    "64": "icons/icons-64.png",
    "128": "icons/icons-128.png"
  },
  "permissions": [
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{bc257ae3-0b96-485e-9241-a0cbd32f4ed9}",
      "strict_min_version": "100.0"
    }
  }
}