Examine source code of Export LocalStorage

{
  "author": "Soramie",
  "homepage_url": "https://github.com/king2gj/ExportLocalStorage",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_area": "navbar",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "js": [
        "content.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "icons": {
    "60": "icon.png"
  },
  "description": "Exports LocalStorage data as a downloadable JSON file",
  "manifest_version": 2,
  "name": "Export LocalStorage",
  "permissions": [
    "<all_urls>"
  ],
  "version": "1.0.1",
  "browser_specific_settings": {
    "gecko": {
      "id": "{6688bdd0-c788-47aa-a7a7-9f90b442bf76}"
    }
  }
}