diff --git a/mobile/android/app/mobile.js b/mobile/android/app/mobile.js
index 80eefe6a70d..25026721327 100644
--- a/mobile/android/app/mobile.js
+++ b/mobile/android/app/mobile.js
@@ -662,9 +662,6 @@ pref("reader.parse-on-load.force-enabled", false);
 // The default of font size in reader (1-7)
 pref("reader.font_size", 4);
 
-// The default of margin size in reader (5%-25%)
-pref("reader.margin_size", 5);
-
 // The default color scheme in reader (light, dark, sepia, auto)
 // auto = color automatically adjusts according to ambient light level
 pref("reader.color_scheme", "auto");
diff --git a/mobile/android/chrome/content/aboutReader.html b/mobile/android/chrome/content/aboutReader.html
index ab4af3f62b5..f474cd3fb1a 100644
--- a/mobile/android/chrome/content/aboutReader.html
+++ b/mobile/android/chrome/content/aboutReader.html
@@ -31,8 +31,6 @@
         <ul id="font-type-buttons" class="segmented-button"></ul>
         <hr></hr>
         <div id="font-size-control" class="step-control"></div>
-        <hr></hr>
-        <div id="margin-size-control" class="step-control"></div>
       </li>
     </ul>
     <li><a id="list-button" class="button list-button" href="#"></a></li>
diff --git a/mobile/android/chrome/content/aboutReader.js b/mobile/android/chrome/content/aboutReader.js
index e008727e2fd..0b37bfb44d2 100644
--- a/mobile/android/chrome/content/aboutReader.js
+++ b/mobile/android/chrome/content/aboutReader.js
@@ -91,12 +91,6 @@ let AboutReader = function(doc, win) {
     this._FONT_SIZE_MIN, this._FONT_SIZE_MAX, this._FONT_SIZE_STEP, Services.prefs.getIntPref("reader.font_size"),
     this._onFontSizeChange.bind(this));
 
-  let marginTitle = gStrings.GetStringFromName("aboutReader.marginTitle");
-  this._marginSize = 0;
-  this._setupStepControl("margin-size-control", marginTitle,
-    this._MARGIN_SIZE_MIN, this._MARGIN_SIZE_MAX, this._MARGIN_SIZE_STEP, Services.prefs.getIntPref("reader.margin_size"),
-    this._onMarginSizeChange.bind(this));
-
   dump("Decoding query arguments");
   let queryArgs = this._decodeQueryString(win.location.href);
 
@@ -118,9 +112,6 @@ AboutReader.prototype = {
   _FONT_SIZE_MIN: 1,
   _FONT_SIZE_MAX: 7,
   _FONT_SIZE_STEP: 1,
-  _MARGIN_SIZE_MIN: 5,
-  _MARGIN_SIZE_MAX: 25,
-  _MARGIN_SIZE_STEP: 5,
 
   _BLOCK_IMAGES_SELECTOR: ".content p > img:only-child, " +
                           ".content p > a:only-child > img:only-child, " +
@@ -298,18 +289,6 @@ AboutReader.prototype = {
     });
   },
 
-  _onMarginSizeChange: function Reader_onMarginSizeChange(newMarginSize) {
-    let doc = this._doc;
-
-    this._marginSize = newMarginSize;
-    doc.body.style.marginLeft = this._marginSize + "%";
-    doc.body.style.marginRight = this._marginSize + "%";
-
-    this._updateImageMargins();
-
-    Services.prefs.setIntPref("reader.margin_size", this._marginSize);
-  },
-
   _onFontSizeChange: function Reader_onFontSizeChange(newFontSize) {
     let bodyClasses = this._doc.body.classList;
 
diff --git a/mobile/android/locales/en-US/chrome/aboutReader.properties b/mobile/android/locales/en-US/chrome/aboutReader.properties
index 6c7866d4f00..56a24f30bde 100644
--- a/mobile/android/locales/en-US/chrome/aboutReader.properties
+++ b/mobile/android/locales/en-US/chrome/aboutReader.properties
@@ -6,7 +6,6 @@ aboutReader.loading=Loading...
 aboutReader.loadError=Failed to load article from page
 
 aboutReader.textTitle=Text
-aboutReader.marginTitle=Margins
 
 aboutReader.colorSchemeLight=Light
 aboutReader.colorSchemeDark=Dark