Examine source code of Penny Resume

{
  "manifest_version": 3,
  "name": "Penny Resume",
  "short_name": "Penny Resume",
  "description": "Tailored resume PDF for any job posting. One click.",
  "version": "0.2.1",
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "action": {
    "default_popup": "popup.html",
    "default_title": "Penny Resume — tailor this job",
    "default_icon": {
      "16": "icons/16.png",
      "32": "icons/32.png",
      "48": "icons/48.png",
      "128": "icons/128.png"
    }
  },
  "background": {
    "service_worker": "background.js",
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "permissions": [
    "storage",
    "activeTab",
    "scripting",
    "downloads",
    "notifications"
  ],
  "host_permissions": [
    "https://api.pennyresume.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://pennyresume.com/onboarding*",
        "https://pennyresume.com/post-signin*",
        "https://pennyresume.com/dashboard*"
      ],
      "js": [
        "content-script.js"
      ],
      "run_at": "document_start",
      "all_frames": false,
      "world": "ISOLATED"
    }
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'; base-uri 'none'"
  },
  "commands": {
    "generate": {
      "suggested_key": {
        "default": "Ctrl+Shift+G",
        "mac": "Command+Shift+G"
      },
      "description": "Generate resume"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "pr@pennyresume.com",
      "strict_min_version": "121.0",
      "data_collection_permissions": {
        "required": [
          "authenticationInfo",
          "websiteContent"
        ]
      }
    }
  }
}