Examine source code of Group Tabs

{
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "73.0",
      "id": "wwwazz333@gmail.com"
    }
  },
  "icons": {
    "32": "icons/icon32.png",
    "48": "icons/icon.png",
    "64": "icons/icon64.png",
    "128": "icons/icon128.png",
    "256": "icons/icon256.png"
  },
  "background": {
    "page": "background.html"
  },
  "commands": {
    "switch-folder": {
      "suggested_key": {
        "default": "Ctrl+Shift+F"
      },
      "description": "Switch to next folder"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "folderBar.js"
      ]
    }
  ],
  "browser_action": {
    "browser_style": true,
    "default_title": "Group Tabs",
    "default_popup": "tabs.html"
  },
  "description": "A Folder Tab creator & manager.",
  "manifest_version": 2,
  "name": "Group Tabs",
  "permissions": [
    "tabs",
    "storage",
    "tabHide"
  ],
  "version": "0.1"
}