--- a/b2g/chrome/content/settings.js
+++ b/b2g/chrome/content/settings.js
@@ -486,17 +486,16 @@ let settingsToObserve = {
     resetToPref: true
   },
   'dom.mozApps.use_reviewer_certs': false,
   'dom.mozApps.signed_apps_installable_from': 'https://marketplace.firefox.com',
   'layers.draw-borders': false,
   'layers.draw-tile-borders': false,
   'layers.dump': false,
   'layers.enable-tiles': true,
-  'layers.simple-tiles': false,
   'layers.effect.invert': false,
   'layers.effect.grayscale': false,
   'layers.effect.contrast': "0.0",
   'privacy.donottrackheader.enabled': false,
   'ril.radio.disabled': false,
   'ril.mms.requestReadReport.enabled': {
     prefName: 'dom.mms.requestReadReport',
     defaultValue: true