User Agent Switcher 0.7.2
The User Agent Switcher extension adds a menu and a toolbar button to switch the user agent of the browser.
在研读JForum源码时遇到过ClickstreamFilter.java过滤来自客户端的每个请求，源码中通过request获取请求头User-Agent信息，来判断当前请求是否来自搜索引擎和机器人。
它的功能体现主要在于，在网站规模达到一定程度时，要求针对不同的浏览客户端进行不同的显示方式，会根据这个字段信息来设置不同用户的不同访问体验。例如，当我们直接访问http://www.google.com时，Google会通过请求头User-Agent消息来判断请求是否来源自手机客户端，从而返回适合于手机浏览的页面回来。
对多种不同客户端请求进行判断提供了依据。
官方地址:
https://addons.mozilla.org/zh-CN/firefox/addon/59
XHTML Mobile Profile 0.5.3
https://addons.mozilla.org/en-US/firefox/addon/1345/?src=api
Firefox does not natively support the mime-type application/vnd.wap.xhtml+xml. This is one of the possible mime-types for XHTML Mobile Profile. This extension adds support for this mime-type. (The other, application/xhtml+xml, is supported…
With version 0.5, support for multipart/mixed content is added. This is not true support, the addon simply removes the HTML from the multipart packaging so that the browser can render it properly.
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