Examine source code of Tab Teleporter

{
  "applications": {
    "gecko": {
      "id": "movetab@ns.petersimonyi.ca",
      "strict_min_version": "60.0a1"
    }
  },
  "author": "Peter Simonyi",
  "background": {
    "scripts": [
      "main.js"
    ]
  },
  "default_locale": "en_CA",
  "description": "Move tabs with the context menu.",
  "homepage_url": "https://github.com/psimonyi/movetab",
  "icons": {
    "16": "movetab-16.svg",
    "32": "movetab-32.svg",
    "48": "movetab-48.svg",
    "64": "movetab-32.svg",
    "96": "movetab-48.svg"
  },
  "manifest_version": 2,
  "name": "Tab Teleporter",
  "options_ui": {
    "browser_style": false,
    "page": "options.html"
  },
  "permissions": [
    "<all_urls>",
    "menus",
    "sessions",
    "storage",
    "tabs"
  ],
  "version": "6resigned1"
}