Examine source code of Tabs importer exporter

{
  "manifest_version": 2,
  "version": "0.4",
  "name": "Tabs importer exporter",
  "description": "Import and export tabs as a json file.",
  "permissions": [
    "tabs",
    "downloads"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "browser_style": true,
    "default_title": "Tabs importer exporter",
    "default_popup": "tabs.html"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ab17cf31-d05a-44c9-9b9b-603023cf9ce1}"
    }
  }
}