Examine source code of Q Tab Switcher

{
  "manifest_version": 2,
  "name": "Q Tab Switcher",
  "version": "1.0",
  "description": "Makes switching between tabs more convenient, like Alt+Tab.",
  "homepage_url": "https://github.com/",
  "permissions": [
    "tabs",
    "storage"
  ],
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Q Tab Switcher"
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "commands": {
    "switch-tabs": {
      "suggested_key": {
        "default": "Alt+Q"
      },
      "description": "Trigger tab switcher (cycle forward)"
    },
    "switch-tabs-back": {
      "suggested_key": {
        "default": "Alt+Shift+Q"
      },
      "description": "Trigger tab switcher (cycle backward)"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "qtabsw@gmail.com",
      "strict_min_version": "126.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}