@namespace url(http://www.w3.org/1999/xhtml);

@-moz-document url-prefix("http://www.chron.com/apps/comics/") 
{
 #CHRON_ADPLACEMENT_Top1, #adviewer_div, #masthead, .tertiarybar, .pl_logline, #reg_name, #reg_nonmember, #secondary_nav, #branding, #midmast, #chronMenu2w784, #weathermodule, #pagewidthComp, #footer { display: none !important } 
}