--- a/toolkit/content/contentAreaUtils.js
+++ b/toolkit/content/contentAreaUtils.js
@@ -418,17 +418,18 @@ function internalPersist(persistArgs)
     persist.saveDocument(persistArgs.sourceDocument, targetFileURL, filesFolder,
                          persistArgs.targetContentType, encodingFlags, kWrapColumn);
   } else {
     let privacyContext = persistArgs.initiatingWindow
                                     .QueryInterface(Components.interfaces.nsIInterfaceRequestor)
                                     .getInterface(Components.interfaces.nsIWebNavigation)
                                     .QueryInterface(Components.interfaces.nsILoadContext);
     persist.saveURI(persistArgs.sourceURI,
-                    persistArgs.sourceCacheKey, persistArgs.sourceReferrer, Ci.nsIHttpChannel.REFERRER_POLICY_DEFAULT,
+                    persistArgs.sourceCacheKey, persistArgs.sourceReferrer,
+                    Ci.nsIHttpChannel.REFERRER_POLICY_NO_REFERRER_WHEN_DOWNGRADE,
                     persistArgs.sourcePostData, null, targetFileURL, privacyContext);
   }
 }
 
 /**
  * Structure for holding info about automatically supplied parameters for
  * internalSave(...). This allows parameters to be supplied so the user does not
  * need to be prompted for file info.

--- a/toolkit/mozapps/extensions/LightweightThemeManager.jsm
+++ b/toolkit/mozapps/extensions/LightweightThemeManager.jsm
@@ -767,17 +767,17 @@ function _persistImage(sourceURL, localF
     Ci.nsIWebBrowserPersist.PERSIST_FLAGS_AUTODETECT_APPLY_CONVERSION |
     (PERSIST_BYPASS_CACHE ?
        Ci.nsIWebBrowserPersist.PERSIST_FLAGS_BYPASS_CACHE :
        Ci.nsIWebBrowserPersist.PERSIST_FLAGS_FROM_CACHE);
 
   persist.progressListener = new _persistProgressListener(successCallback);
 
   persist.saveURI(sourceURI, null,
-                  null, Ci.nsIHttpChannel.REFERRER_POLICY_DEFAULT,
+                  null, Ci.nsIHttpChannel.REFERRER_POLICY_NO_REFERRER_WHEN_DOWNGRADE,
                   null, null, targetURI, null);
 }
 
 function _persistProgressListener(successCallback) {
   this.onLocationChange = function persistProgressListener_onLocationChange() {};
   this.onProgressChange = function persistProgressListener_onProgressChange() {};
   this.onStatusChange   = function persistProgressListener_onStatusChange() {};
   this.onSecurityChange = function persistProgressListener_onSecurityChange() {};