diff --git a/browser/app/profile/firefox.js b/browser/app/profile/firefox.js
index c9c7c5d1ab30..c878dd726658 100644
--- a/browser/app/profile/firefox.js
+++ b/browser/app/profile/firefox.js
@@ -1035,7 +1035,6 @@ pref("devtools.debugger.remote-connection-retries", 3);
 pref("devtools.debugger.remote-timeout", 20000);
 
 // The default Debugger UI settings
-pref("devtools.debugger.ui.height", 250);
 pref("devtools.debugger.ui.win-x", 0);
 pref("devtools.debugger.ui.win-y", 0);
 pref("devtools.debugger.ui.win-width", 900);
diff --git a/browser/devtools/debugger/DebuggerUI.jsm b/browser/devtools/debugger/DebuggerUI.jsm
index 6e76b7fb5223..da4e6335ff9f 100644
--- a/browser/devtools/debugger/DebuggerUI.jsm
+++ b/browser/devtools/debugger/DebuggerUI.jsm
@@ -173,12 +173,6 @@ DebuggerUI.prototype = {
     return '_chromeDebugger' in this ? this._chromeDebugger : null;
   },
 
-  /**
-   * Get the preferences associated with the debugger frontend.
-   * @return object
-   */
-  get preferences() Prefs,
-
   /**
    * Currently, there can only be one debugger per tab.
    * Show an asynchronous notification which asks the user to switch the
@@ -279,7 +273,6 @@ DebuggerPane.prototype = {
     this._splitter.setAttribute("class", "devtools-horizontal-splitter");
 
     this._frame = ownerDocument.createElement("iframe");
-    this._frame.height = Prefs.height;
 
     this._nbox = gBrowser.getNotificationBox(this._tab.linkedBrowser);
     this._nbox.appendChild(this._splitter);
@@ -326,7 +319,6 @@ DebuggerPane.prototype = {
       }, true)
     }
 
-    Prefs.height = this._frame.height;
     this._frame.removeEventListener("Debugger:Unloaded", this.close, true);
     this._nbox.removeChild(this._splitter);
     this._nbox.removeChild(this._frame);
@@ -599,21 +591,7 @@ XPCOMUtils.defineLazyGetter(L10N, "stringBundle", function() {
 /**
  * Shortcuts for accessing various debugger preferences.
  */
-let Prefs = {
-  /**
-   * Gets the preferred height of the debugger pane.
-   * @return number
-   */
-  get height()
-    Services.prefs.getIntPref("devtools.debugger.ui.height"),
-
-  /**
-   * Sets the preferred height of the debugger pane.
-   * @param number aValue
-   */
-  set height(aValue)
-    Services.prefs.setIntPref("devtools.debugger.ui.height", aValue)
-};
+let Prefs = {};
 
 /**
  * Gets the preferred default remote debugging host.
diff --git a/browser/devtools/debugger/debugger-controller.js b/browser/devtools/debugger/debugger-controller.js
index 331414d3baa6..5f8f94d30771 100644
--- a/browser/devtools/debugger/debugger-controller.js
+++ b/browser/devtools/debugger/debugger-controller.js
@@ -1609,7 +1609,6 @@ let Prefs = {
   }
 };
 
-Prefs.map("Int", "height", "devtools.debugger.ui.height");
 Prefs.map("Int", "windowX", "devtools.debugger.ui.win-x");
 Prefs.map("Int", "windowY", "devtools.debugger.ui.win-y");
 Prefs.map("Int", "windowWidth", "devtools.debugger.ui.win-width");