Examine source code of Tab Group Extras

{
  "manifest_version": 2,
  "name": "Tab Group Extras",
  "version": "1.0.3",
  "description": "Color tab groups by keyword, copy group names, add quick grouping shortcuts, and keep new tabs in the same group.",
  "browser_specific_settings": {
    "gecko": {
      "id": "@luascfl",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "categories": {
    "firefox": [
      "tabs"
    ]
  },
  "permissions": [
    "storage",
    "tabGroups",
    "tabs",
    "menus",
    "contextMenus",
    "clipboardWrite",
    "notifications"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_title": "Tab Group Extras",
    "default_popup": "popup/popup.html",
    "default_icon": "icons/icon-32.png"
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "commands": {
    "create-active-tab-group": {
      "suggested_key": {
        "default": "Alt+G",
        "mac": "Alt+G"
      },
      "description": "Create a new tab group with the active tab or selection"
    },
    "rename-current-tab-group": {
      "suggested_key": {
        "default": "Alt+B",
        "mac": "Alt+B"
      },
      "description": "Rename the tab group that contains the active tab"
    }
  },
  "web_accessible_resources": [
    "rename.html",
    "rename.js"
  ]
}