Pull to refresh is standard behavior in chrome, but not in firefox. It's very handy on mobile, so I install an extension to provide it on FF. But I can understa

Pull to refresh is standard behavior in chrome, but not in firefox. It's very handy on mobile, so I install an extension to provide it on FF. But I can understand you may want to provide it to your user to make the experience better. However, unless you can detect that the feature is available or not, this may very well be buggy on browsers that have it already.