diff --git a/application/palemoon/components/preferences/security.xul b/application/palemoon/components/preferences/security.xul
index d3d321b16c..b12946f2a5 100644
--- a/application/palemoon/components/preferences/security.xul
+++ b/application/palemoon/components/preferences/security.xul
@@ -50,6 +50,15 @@
                   name="security.cert_pinning.enforcement_level"
                   type="int"/>
       
+      <!-- Opportunistic Encryption -->
+                  
+      <preference id="network.http.upgrade-insecure-requests"
+                  name="network.http.upgrade-insecure-requests"
+                  type="bool"/>
+      <preference id="network.http.altsvc.oe"
+                  name="network.http.altsvc.oe"
+                  type="bool"/>
+      
       <!-- XSS Filter -->
       <!--
       <preference id="security.xssfilter.enable" name="security.xssfilter.enable" type="bool"/>
@@ -144,6 +153,16 @@
                   oncommand="gSecurityPane.updateHPKPPref();"/>
       </vbox>
     </groupbox>
+    
+    <groupbox id="OpportunisticEncryption">
+      <caption label="&OpEnc.label;"/>
+      <checkbox id="enableUIROpEnc"
+                label="&enableUIROpEnc.label;"
+                preference="network.http.upgrade-insecure-requests" />
+      <checkbox id="enableAltSvcOpEnc"
+                label="&enableAltSvcOpEnc.label;"
+                preference="network.http.altsvc.oe" />
+    </groupbox>    
 
     <!-- XSS Filter -->
     <!--
diff --git a/application/palemoon/locales/en-US/chrome/browser/preferences/security.dtd b/application/palemoon/locales/en-US/chrome/browser/preferences/security.dtd
index 2bd3b3aecf..930736d56c 100644
--- a/application/palemoon/locales/en-US/chrome/browser/preferences/security.dtd
+++ b/application/palemoon/locales/en-US/chrome/browser/preferences/security.dtd
@@ -40,6 +40,10 @@
 <!ENTITY  enableHPKP.label           "Enable Certificate Key Pinning (HPKP)">
 <!ENTITY  enableHPKP.accesskey       "C">
 
+<!ENTITY  OpEnc.label                "Opportunistic Encryption (OE)">
+<!ENTITY  enableUIROpEnc.label       "Enable Upgrade Insecure Requests">
+<!ENTITY  enableAltSvcOpEnc.label    "Enable HTTP Alternative Services for OE">
+
 <!ENTITY  XSSFilt.label              "XSS Filter">
 <!ENTITY  enableXSSFilt.label        "Enable XSS filter">
 <!ENTITY  enableXSSFilt.accesskey    "f">