Examine source code of TabsToFile

{
  "description": "This addon enables download of all open tabs as files, in a compressed zip file.",
  "manifest_version": 2,
  "name": "TabsToFile",
  "version": "3.3",
  "homepage_url": "https://github.com/Rebel1898",
  "browser_specific_settings": {
    "gecko": {
      "id": "{323ca25d-90cf-4ff1-aaba-f9b3661f25b0}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "browser_action": {
    "browser_style": true,
    "default_icon": "icons/dibujo.svg",
    "default_title": "TabsToFile"
  },
  "permissions": [
    "downloads",
    "storage",
    "tabs",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js",
      "fflate.min.js"
    ]
  },
  "incognito": "spanning",
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false,
    "browser_style": true
  }
}