We are doing research to understand the impact of Firefox Reset/Refresh in bug #872172. If we see that there is a clear net positive to using Firefox Refresh, we should add that to the Thank You page. We don't want to offer it until after the user leaves feedback or we'll risk losing valuable data.
The Input service has been decommissioned (see bug 1315316) and has been replaced by a redirect to an external vendor (SurveyGizmo). I'm bulk WONTFIXing Input bugs that do not appear to be relevant anymore.