Examine source code of Stealthy

{
  "background": {
    "scripts": [
      "/js/functions.js",
      "/js/settings.js",
      "/js/proxy_controller.js",
      "/js/background.js"
    ]
  },
  "browser_action": {
    "browser_style": true,
    "default_icon": "img/offline.png",
    "default_title": "Stealthy is enabled, click to disable"
  },
  "description": "Stealthy allows you to see blocked websites from a click of a button.",
  "icons": {
    "16": "img/icon16.png",
    "32": "img/icon32.png",
    "48": "img/icon48.png",
    "128": "img/icon128.png"
  },
  "applications": {
    "gecko": {
      "id": "stealthyextension@gmail.com",
      "strict_min_version": "60.0"
    }
  },
  "manifest_version": 2,
  "name": "Stealthy",
  "options_ui": {
    "page": "options.html"
  },
  "permissions": [
    "proxy",
    "contextMenus",
    "<all_urls>"
  ],
  "version": "6.0",
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Alt+Shift+S"
      },
      "description": "Toggle Stealthy status"
    }
  }
}