Examine source code of Better Workspaces

{
  "manifest_version": 2,
  "name": "Window Workspaces",
  "version": "1.0.11",
  "description": "Create named workspaces that open as dedicated browser windows, auto-save their tab sets and tab groups, and sync across devices.",
  "author": "Personal Use",
  "browser_specific_settings": {
    "gecko": {
      "id": "workspaces@personal.extension",
      "strict_min_version": "139.0"
    }
  },
  "permissions": [
    "tabs",
    "tabGroups",
    "storage",
    "menus"
  ],
  "background": {
    "scripts": [
      "shared/constants.js",
      "shared/utils.js",
      "shared/storage.js",
      "background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png"
    },
    "default_title": "Workspaces",
    "default_popup": "popup/popup.html"
  },
  "sidebar_action": {
    "default_title": "Workspaces",
    "default_panel": "sidebar/sidebar.html",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png"
    }
  },
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": true
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  }
}