Examine source code of Sebov Autofill

{
  "manifest_version": 2,
  "name": "Sebov Autofill",
  "version": "1.0.2",
  "description": "Save form inputs on a site and autofill them later.",
  "permissions": [
    "storage",
    "tabs",
    "activeTab",
    "downloads",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "commands": {
    "quick-autofill": {
      "suggested_key": {
        "default": "Ctrl+Shift+Y",
        "mac": "Ctrl+Shift+Y"
      },
      "description": "Autofill the current page"
    }
  },
  "browser_action": {
    "default_title": "Sebov Autofill",
    "default_popup": "popup.html"
  },
  "icons": {
    "32": "icons/icon_32.png",
    "64": "icons/icon_64.png",
    "128": "icons/icon_128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a0fac624-bea8-4966-b667-205e831c0519}",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}