diff --git a/mobile/app/mobile.js b/mobile/app/mobile.js
index e5bd319b6ab8..b813b5707e27 100644
--- a/mobile/app/mobile.js
+++ b/mobile/app/mobile.js
@@ -367,11 +367,11 @@ pref("browser.ui.kinetic.swipeLength", 160);
 // zooming
 pref("browser.ui.zoom.pageFitGranularity", 10); // don't zoom to fit by less than 1/10.
 
-// Touch radius
+// Touch radius (area around the touch location to look for target elements):
 pref("browser.ui.touch.left", 8);
 pref("browser.ui.touch.right", 8);
-pref("browser.ui.touch.top", 4);
-pref("browser.ui.touch.bottom", 12);
+pref("browser.ui.touch.top", 12);
+pref("browser.ui.touch.bottom", 4);
 pref("browser.ui.touch.weight.visited", 120); // percentage
 
 // plugins
diff --git a/mobile/chrome/content/browser.js b/mobile/chrome/content/browser.js
index 8811e06c6efa..734d6733efcb 100644
--- a/mobile/chrome/content/browser.js
+++ b/mobile/chrome/content/browser.js
@@ -1960,9 +1960,9 @@ const ElementTouchHelper = {
                                                true,   /* ignore root scroll frame*/
                                                false); /* don't flush layout */
 
-    let nodes = aWindowUtils.nodesFromRect(aX, aY, this.radius.bottom,
+    let nodes = aWindowUtils.nodesFromRect(aX, aY, this.radius.top,
                                                    this.radius.right,
-                                                   this.radius.top,
+                                                   this.radius.bottom,
                                                    this.radius.left, true, false);
 
     // return early if the click is just over a clickable element