Examine source code of TabsToFile

{
  "manifest_version": 2,
  "name": "TabsToFile",
  "version": "1.0",
  "description": "Allows viewing and exporting selected Tabs' URLs as html or txt document",
  "homepage_url": "https://github.com/grn-x/TabsToFiles-FirefoxAddon",
  "permissions": [
    "tabs",
    "menus",
    "storage",
    "contextMenus",
    "activeTab",
    "<all_urls>"
  ],
  "icons": {
    "48": "border-48.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{dcf2758b-3906-4f72-8164-fe2b9fb1a30f}"
    }
  }
}