automatically set css according to file extention even when embeded style sheet is on.
automatically set css according to file extention
even when embeded style sheet is on.

pazos/koreader,ashang/koreader,Frenzie/koreader,frankyifei/koreader,Hzj-jie/koreader,ashhher3/koreader,NiLuJe/koreader,koreader/koreader,chrox/koreader,noname007/koreader,robert00s/koreader,houqp/koreader,Markismus/koreader,apletnev/koreader,Frenzie/koreader,mwoz123/koreader,lgeek/koreader,chihyang/koreader,poire-z/koreader,poire-z/koreader,mihailim/koreader,koreader/koreader,NickSavage/koreader,NiLuJe/koreader