add firefox chrome diff screenshot.
switch screenshot.
switch screenshot.
add 2013-09-23-some-firefox-chrome.png.
patch by CrBoy from http://paste.plurk.com/show/zhAyaAcOVSb2tSYWCQZv/
add <ul> ... </ul> and include css to <li> ... </li>.
Merge branch 'dev'