fix travis and Firefox
fix travis and Firefox

castle-dev/angular-kickstart,hkaushalya/angular-kickstart,marvinlee/angular-kickstart,spartDev/sub2webAngular,vesparny/angular-kickstart,xiaxuewuhen001/angular-kickstart,marvinlee/angular-kickstart,hkaushalya/angular-kickstart,backand/ng-s3-kickstart,backand/angular-kickstart,spike1292/sint-game,castle-dev/angular-kickstart,backand/angular-kickstart,adaptivedev/backand_todomgr,spartDev/sub2webAngular,backand/ng-s3-kickstart,bradleybossard/angular-kickstart,bradleybossard/angular-kickstart,dcm31/web-app-chatbot,vanessadyce/angular-backand,AdapTeach/code-assessments-ui,xiaxuewuhen001/angular-kickstart,vesparny/angular-kickstart,vanessadyce/angular-backand,dcm31/web-app-chatbot,adaptivedev/backand_todomgr