Examine source code of SmartProxy

{
  "name": "__MSG_extensionName__",
  "version": "2.2",
  "manifest_version": 2,
  "author": "Salar Khalilzadeh",
  "description": "__MSG_extensionDescription__",
  "homepage_url": "https://github.com/salarcode/SmartProxy",
  "default_locale": "en",
  "icons": {
    "16": "icons/smartproxy-16.png",
    "24": "icons/smartproxy-24.png",
    "48": "icons/smartproxy-48.png",
    "96": "icons/smartproxy-96.png",
    "128": "icons/smartproxy-128.png"
  },
  "permissions": [
    "<all_urls>",
    "activeTab",
    "tabs",
    "proxy",
    "webRequest",
    "webRequestBlocking",
    "storage",
    "unlimitedStorage",
    "notifications",
    "dns"
  ],
  "browser_action": {
    "browser_style": true,
    "default_title": "__MSG_extensionName__",
    "default_popup": "ui/popup.html",
    "default_icon": {
      "16": "icons/smartproxy-16.png",
      "24": "icons/smartproxy-24.png",
      "48": "icons/smartproxy-48.png",
      "96": "icons/smartproxy-96.png",
      "128": "icons/smartproxy-128.png"
    }
  },
  "background": {
    "scripts": [
      "core.js"
    ]
  },
  "options_ui": {
    "page": "ui/settings.html",
    "open_in_tab": true,
    "browser_style": false
  },
  "commands": {
    "next-proxy-server": {
      "suggested_key": {
        "default": "Ctrl+Shift+Period"
      },
      "description": "Switch to next proxy server as the active proxy"
    },
    "previous-proxy-server": {
      "suggested_key": {
        "default": "Ctrl+Shift+Comma"
      },
      "description": "Switch to the next previous server as the active proxy"
    },
    "proxy-mode-none": {
      "suggested_key": {
        "default": "Ctrl+Shift+1"
      },
      "description": "Switch to 'No Proxy' mode"
    },
    "proxy-mode-smart": {
      "suggested_key": {
        "default": "Ctrl+Shift+2"
      },
      "description": "Switch to 'Smart Proxy' mode"
    },
    "proxy-mode-always": {
      "suggested_key": {
        "default": "Ctrl+Shift+3",
        "mac": "Command+Shift+9"
      },
      "description": "Switch to 'Always Enabled' mode"
    },
    "proxy-mode-system": {
      "suggested_key": {
        "default": "Ctrl+Shift+4",
        "mac": "Command+Shift+0"
      },
      "description": "Switch to 'System' mode"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "smartproxy@salarcode.com",
      "strict_min_version": "100.0"
    },
    "gecko_android": {
      "strict_min_version": "120.0"
    }
  }
}