diff --git a/application/basilisk/base/content/tabbrowser.xml b/application/basilisk/base/content/tabbrowser.xml
index 8056440e7..ddf968ebb 100644
--- a/application/basilisk/base/content/tabbrowser.xml
+++ b/application/basilisk/base/content/tabbrowser.xml
@@ -371,17 +371,6 @@
         <parameter name="aWindow"/>
         <body>
         <![CDATA[
-          // When not using remote browsers, we can take a fast path by getting
-          // directly from the content window to the browser without looping
-          // over all browsers.
-          if (!gMultiProcessBrowser) {
-            let browser = aWindow.QueryInterface(Ci.nsIInterfaceRequestor)
-                                 .getInterface(Ci.nsIWebNavigation)
-                                 .QueryInterface(Ci.nsIDocShell)
-                                 .chromeEventHandler;
-            return this.getTabForBrowser(browser);
-          }
-
           for (let i = 0; i < this.browsers.length; i++) {
             // NB: We use contentWindowAsCPOW so that this code works both
             // for remote browsers as well. aWindow may be a CPOW.
