--- a/browser/components/preferences/in-content/privacy.xul
+++ b/browser/components/preferences/in-content/privacy.xul
@@ -275,17 +275,17 @@
 
 <!-- Tracking -->
 <groupbox id="trackingGroup" data-category="panePrivacy" hidden="true">
   <caption><label data-l10n-id="tracking-header"/></caption>
   <vbox>
     <hbox align="start">
       <vbox flex="1">
         <description data-l10n-id="tracking-desc">
-          <a id="trackingProtectionLearnMore" data-l10n-name="learn-more" target="_blank" class="learnMore text-link"/>
+          <html:a id="trackingProtectionLearnMore" data-l10n-name="learn-more" target="_blank" class="learnMore text-link"/>
         </description>
       </vbox>
       <spacer flex="1"/>
     </hbox>
     <hbox>
       <vbox id="trackingProtectionBox" flex="1" hidden="true">
         <vbox>
           <hbox id="trackingProtectionExtensionContentLabel" align="center" hidden="true">