diff --git a/modules/libpref/src/init/all.js b/modules/libpref/src/init/all.js
index c6ada1ad2a20..bc3accf04cb1 100644
--- a/modules/libpref/src/init/all.js
+++ b/modules/libpref/src/init/all.js
@@ -119,6 +119,7 @@ pref("browser.helperApps.neverAsk.saveToDisk", "");
 pref("browser.helperApps.neverAsk.openFile", "");
 
 pref("accessibility.browsewithcaret", false);
+pref("accessibility.warn_on_browsewithcaret", true);
 pref("accessibility.usetexttospeech", "");
 pref("accessibility.usebrailledisplay", "");
 pref("accessibility.accesskeycausesactivation", true);
diff --git a/xpfe/global/resources/content/bindings/browser.xml b/xpfe/global/resources/content/bindings/browser.xml
index 6960c75e2c6d..ab68d9c54b60 100644
--- a/xpfe/global/resources/content/bindings/browser.xml
+++ b/xpfe/global/resources/content/bindings/browser.xml
@@ -327,8 +327,19 @@
       <handler event="keypress" keycode="VK_F7">
         <![CDATA[
           // Toggle browse with caret mode
-          var browseWithCaretOn = this.mPrefs.getBoolPref("accessibility.browsewithcaret");
-          if (this.mPrefs.getBoolPref("accessibility.warn_on_browsewithcaret") && !browseWithCaretOn) {
+          var browseWithCaretOn = false;
+          var warn = true;
+
+          try {
+            warn = this.mPrefs.getBoolPref("accessibility.warn_on_browsewithcaret");
+          } catch (ex) {
+          }
+
+          try {
+            browseWithCaretOn = this.mPrefs.getBoolPref("accessibility.browsewithcaret");
+          } catch (ex) {
+          }
+          if (warn && !browseWithCaretOn) {
             var buttonPressed = {value:1};
             var checkValue = {value:false};
             promptService = Components.classes["@mozilla.org/embedcomp/prompt-service;1"].getService(Components.interfaces.nsIPromptService);
@@ -344,12 +355,19 @@
               checkValue, buttonPressed);
             if (!buttonPressed || buttonPressed.value != 0)
               return;
-            if (checkValue.value)
-              this.mPrefs.setBoolPref("accessibility.warn_on_browsewithcaret", false);
+            if (checkValue.value) {
+              try {
+                this.mPrefs.setBoolPref("accessibility.warn_on_browsewithcaret", false);
+              }
+              catch (ex) {
+              }
+            }
           }
 
           // Toggle the pref
-          this.mPrefs.setBoolPref("accessibility.browsewithcaret",!browseWithCaretOn);
+          try {
+            this.mPrefs.setBoolPref("accessibility.browsewithcaret",!browseWithCaretOn);
+          } catch (ex) {
           }
         ]]>
       </handler>