Examine source code of Best Proxy Switcher

{
  "manifest_version": 2,
  "name": "__MSG_app_name__",
  "short_name": "bps",
  "version": "5.5.0",
  "description": "__MSG_description__",
  "applications": {
    "gecko": {
      "id": "bestproxyswitcher@bestproxyswitcher.com",
      "strict_min_version": "55.0"
    }
  },
  "icons": {
    "16": "icon/icon-16.png",
    "48": "icon/icon-48.png",
    "128": "icon/icon-128.png"
  },
  "browser_action": {
    "default_title": "Best Proxy Switcher",
    "default_popup": "popup.html",
    "default_icon": {
      "19": "19/icon/disabled.png",
      "38": "38/icon/disabled.png"
    }
  },
  "permissions": [
    "cookies",
    "storage",
    "proxy",
    "webRequest",
    "webRequestBlocking",
    "management",
    "privacy",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "commands": {
    "enable-proxy": {
      "suggested_key": {
        "default": "Ctrl+Shift+X"
      },
      "description": "Enable Proxy Server"
    },
    "disable-proxy": {
      "suggested_key": {
        "default": "Ctrl+Shift+Z"
      },
      "description": "Disable Proxy Server"
    }
  },
  "default_locale": "en"
}