Add comment regarding .blur() on embeds.
Add comment regarding .blur() on embeds.

Including embeds for .blur() etc. here is experimental.  It appears to
be the right thing to do for most common use cases.  However, it could
also cripple flash-based sites and games.  See discussion in #1211
and #1194.

philc/vimium,VPashkov/vimium,dimatter/vimium,Aleroniponi/vimium,Lw-Cui/vimium,decaffeinate-examples/vimium,mrmr1993/vimium,Lw-Cui/vimium,willsALMANJ/vimium,gdh1995/vimium,bkudria/vimium,borgified/vimium,crazypenguincode/vimium,zhangmin510/vimium,douglas-larocca/vimium,gdh1995/vimium,csmalin/vimium,hhsue/vimium,borgified/vimium,csmalin/vimium,wildeyes/vimium,decaffeinate-examples/vimium,borgified/vimium,decaffeinate-examples/vimium,smblott-github/vimium,poacher2k/vimium,bkudria/vimium,elegantwww/vimium,mrmr1993/vimium,willsALMANJ/vimium,smblott-github/vimium,philc/vimium,smblott-github/vimium,PrestanceDesign/vimium,Lw-Cui/vimium,mrmr1993/vimium,tuchangwei/vimium,justalittlenoob/vimium,Robinson10240/vimium,hhsue/vimium,justalittlenoob/vimium,cyrixhero/vimium,elderbas/vimium,dimatter/vimium,wildeyes/vimium,gdh1995/vimium,Aleroniponi/vimium,hhsue/vimium,willsALMANJ/vimium,PickRelated/vimium,dimatter/vimium,Robinson10240/vimium,PickRelated/vimium,elderbas/vimium,crazypenguincode/vimium,douglas-larocca/vimium,PickRelated/vimium,poacher2k/vimium,VPashkov/vimium,Aleroniponi/vimium,wildeyes/vimium,elegantwww/vimium,PrestanceDesign/vimium,justalittlenoob/vimium,PrestanceDesign/vimium,Robinson10240/vimium,elegantwww/vimium,zhangmin510/vimium,philc/vimium,cyrixhero/vimium,elderbas/vimium,tuchangwei/vimium,douglas-larocca/vimium,tuchangwei/vimium,VPashkov/vimium,zhangmin510/vimium,csmalin/vimium,bkudria/vimium,cyrixhero/vimium,poacher2k/vimium