User Agent Mozilla



  1. Firefox User Agent List
  2. User Agent Mozilla 4.0
  3. User-agent: Mozilla/5.0 (windows Nt 6.3
  4. Mozilla User Agent List

A user agent is a computer program representing a person, for example, a browser in a Web context.

Besides a browser, a user agent could be a bot scraping webpages, a download manager, or another app accessing the Web. Along with each request they make to the server, browsers include a self-identifying User-AgentHTTP header called a user agent (UA) string. This string often identifies the browser, its version number, and its host operating system.

Spam bots, download managers, and some browsers often send a fake UA string to announce themselves as a different client. This is known as user agent spoofing.

Check HTTP User-agent string online, detect browser formation, free download HTTP User-Agent Switcher for Chrome. User-Agent通常格式： Mozilla/5.0 (平台) 引擎版本 浏览器版本号 第一部分：Mozilla/5.0. 由于历史上的浏览器大战，当时想获得图文并茂的网页，就必须宣称自己是 Mozilla 浏览器。此事导致如今User-Agent里通常都带有Mozilla字样，出于对历史的尊重，大家都会默认填写该.

The user agent string can be accessed with JavaScript on the client side using the NavigatorID.userAgent property.

Firefox User Agent List

Mozilla

User Agent Mozilla 4.0

A typical user agent string looks like this: 'Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:35.0) Gecko/20100101 Firefox/35.0'.

Learn more

  1. A user agent tells websites what type of browser and operating system you're using. This information helps the web server deliver content that's compatible with your browser. If websites tell you that your browser is outdated or incompatible even though Firefox is.
  2. For example, the default user agent entry for Firefox 83 on Windows 10 (64-bit) would appear as: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:83.0) Gecko/20100101 Firefox/83.0 Note: If your user agent shows a previous Windows version, such as Windows NT 6.1 (Windows 7) instead of Windows NT 10.0 (Windows 10), make sure you are not running.

General knowledge

  • User agent on Wikipedia

User-agent: Mozilla/5.0 (windows Nt 6.3

Technical reference

Mozilla User Agent List

  • RFC 2616: 14.43: The User-Agent header