title: Firefox disable browser zoom but allow element zoom on pinch
body: <p>I've got a site running aimed at touchscreens running Firefox (very specific I know, but it will hopefully help with a solution)
  On the page in question, I've got a d3 map that I'm trying to enable pinch zooming for, however any pinch gesture is causing Firefox to set the zoom for the whole page. Is there a way to prevent the page zooming and only allow the map to zoom?</p>
  
  <p>It's not an issue if I have to modify Firefox config settings but I'd prefer to avoid it and rely entirely on javascript if possible.</p>
  
  <p>Thank you in advance</p>