Examine source code of Tab Stack for Firefox

{
  "manifest_version": 2,
  "name": "Tab Stack for Firefox",
  "short_name": "Tab Stack",
  "homepage_url": "https://github.com/Riajyuu/Tab-Stack",
  "version": "1.0.0",
  "description": "__MSG_extensionDescription__",
  "applications": {
    "gecko": {
      "id": "tabstack@github",
      "strict_min_version": "63.0"
    }
  },
  "icons": {
    "48": "icon.svg",
    "96": "icon.svg"
  },
  "background": {
    "scripts": [
      "main.js"
    ]
  },
  "permissions": [
    "tabs",
    "notifications",
    "menus",
    "activeTab",
    "tabHide"
  ],
  "default_locale": "en"
}