Examine source code of Future Tabs

{
  "manifest_version": 2,
  "name": "FutureTabs",
  "version": "1.6.3",
  "description": "Save and organize your browser tabs with tags and folders",
  "icons": {
    "48": "icons/icon.svg",
    "96": "icons/icon.svg"
  },
  "browser_action": {
    "default_icon": "icons/icon.svg",
    "default_popup": "popup/popup.html",
    "default_title": "FutureTabs"
  },
  "chrome_url_overrides": {
    "newtab": "newtab/newtab.html"
  },
  "background": {
    "scripts": [
      "background/background.js"
    ],
    "persistent": false
  },
  "permissions": [
    "tabs",
    "storage",
    "activeTab",
    "unlimitedStorage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "futuretabs@extension",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}