Automattic/_s — pull request #362 by richardmtl (2013-12-17 05:11:10+00:00)
Title: removing unneeded css declaration and adding notes

Note that Firefox 28 does not use !important in the UA stylesheet
anymore for that declaration, and FF3/4 (and up to FF9) has less than 1% browser share
according to http://en.wikipedia.org/wiki/Template:Firefox_usage_share