Examine source code of Tab Application Switcher

{
  "manifest_version": 2,
  "name": "__MSG_extName__",
  "description": "__MSG_extDescription__",
  "version": "1.2.4",
  "icons": {
    "16": "/icon/16.png",
    "32": "/icon/32.png",
    "48": "/icon/48.png",
    "96": "/icon/96.png",
    "128": "/icon/128.png"
  },
  "default_locale": "en",
  "homepage_url": "https://tabappswitcher.com",
  "author": "Tab Application Switcher",
  "permissions": [
    "tabs",
    "storage",
    "identity",
    "sessions",
    "<all_urls>"
  ],
  "web_accessible_resources": [
    "tabs.html"
  ],
  "commands": {
    "tas_activate": {
      "suggested_key": {
        "default": "Alt+1"
      },
      "description": "Activate Tab Application Switcher"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "tab-application-switcher@tabappswitcher.com",
      "strict_min_version": "109.0"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Tab Application Switcher",
    "default_popup": "popup.html"
  },
  "options_ui": {
    "page": "options.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.google.com/*"
      ],
      "js": [
        "content-scripts/content.js"
      ]
    }
  ]
}