workaround Firefox 31 bug with referencing window.performance in anonymous iframes
workaround Firefox 31 bug with referencing window.performance in anonymous iframes

levexis/boomerang,sdgdsffdsfff/boomerang,FredXue/boomerang,lognormal/boomerang,lognormal/boomerang,FredXue/boomerang,sdgdsffdsfff/boomerang,levexis/boomerang