a css fix for firefox
a css fix for firefox

mef/jsoneditor,amitdesai03/jsoneditor,cobblers-children/jsoneditor,dbirchak/jsoneditor,jayphelps/jsoneditor,shuai959980629/jsoneditor,dbirchak/jsoneditor,mef/jsoneditor,mef/jsoneditor,imkevinyang/jsoneditor,imkevinyang/jsoneditor,amitdesai03/jsoneditor,josdejong/jsoneditor,mcanthony/jsoneditor,imkevinyang/jsoneditor,jayphelps/jsoneditor,cobblers-children/jsoneditor,toanalien/jsoneditor,liukd/jsoneditor,jayphelps/jsoneditor,shuai959980629/jsoneditor,2947721120/jsoneditor,liukd/jsoneditor,2947721120/jsoneditor,DavidGarciaCat/JSON-Editor-Online,josdejong/jsoneditor,mcanthony/jsoneditor,DavidGarciaCat/JSON-Editor-Online,liukd/jsoneditor,cobblers-children/jsoneditor,toanalien/jsoneditor,2947721120/jsoneditor,shuai959980629/jsoneditor,cesarmarinhorj/jsoneditor,amitdesai03/jsoneditor,cesarmarinhorj/jsoneditor,dbirchak/jsoneditor,mcanthony/jsoneditor,cesarmarinhorj/jsoneditor,toanalien/jsoneditor