--- a/dom/base/nsDocument.cpp
+++ b/dom/base/nsDocument.cpp
@@ -2239,16 +2239,26 @@ nsDocument::Reset(nsIChannel* aChannel, 
   nsCOMPtr<nsIURI> uri;
   nsCOMPtr<nsIPrincipal> principal;
   if (aChannel) {
     // Note: this code is duplicated in XULDocument::StartDocumentLoad and
     // nsScriptSecurityManager::GetChannelResultPrincipal.
     // Note: this should match nsDocShell::OnLoadingSite
     NS_GetFinalChannelURI(aChannel, getter_AddRefs(uri));
 
+  bool isWyciwyg = false;
+  uri->SchemeIs("wyciwyg", &isWyciwyg);
+  if (isWyciwyg) {
+    nsCOMPtr<nsIURI> cleanURI;
+    nsresult rv = nsContentUtils::RemoveWyciwygScheme(uri, getter_AddRefs(cleanURI));
+    if (NS_SUCCEEDED(rv)) {
+      uri = cleanURI;
+    }
+  }
+
     nsIScriptSecurityManager *securityManager =
       nsContentUtils::GetSecurityManager();
     if (securityManager) {
       securityManager->GetChannelResultPrincipal(aChannel,
                                                  getter_AddRefs(principal));
     }
   }
 

--- a/dom/html/test/browser_refresh_wyciwyg_url.js
+++ b/dom/html/test/browser_refresh_wyciwyg_url.js
@@ -20,13 +20,13 @@ function test(){
         is(aBrowser.contentDocument.URL, testURL, "Make sure we start at the correct URL");
 
         // test_btn calls document.write() then reloads the document
         test_btn = aBrowser.contentDocument.getElementById("test_btn");
         test_btn.click();
         return BrowserTestUtils.browserLoaded(aBrowser);
     }).then(() => {
         test_btn.click();
-        todo_is(aBrowser.contentDocument.URL, testURL, "Document URL should be identical after reload");
+        is(aBrowser.contentDocument.URL, testURL, "Document URL should be identical after reload");
         gBrowser.removeTab(aTab);
         finish();
     });
 }