Examine source code of Better Workspaces

{
  "manifest_version" : 2 ,
  "name" : "Window Workspaces",
  "version" : "1.0.14",
  "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",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions" : [
    "tabs" ,
    "tabGroups" ,
    "storage" ,
    "menus" ,
    "downloads" ,
    "alarms" 
  ],
  "background" : {
    "scripts" : [
      "shared/constants.js" ,
      "shared/utils.js" ,
      "shared/storage.js" ,
      "shared/backup.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"
  }
}