喜闻乐见地发现TU更细了。

Version 1.6pre5
Released October 10, 2013 85.7 KB
Works with Firefox 17.0 and later Fixed incompatibilities with Fx 20-27.
小白鼠呢~~
——来自耐操的火狐娘
>>Mozilla/5.0 (Windows NT 6.1; WOW64; rv:27.0) Gecko/20100101 Firefox/27.0I