diff --git a/browser/base/content/browser.js b/browser/base/content/browser.js
index 49e067e83329..959be301d5b4 100644
--- a/browser/base/content/browser.js
+++ b/browser/base/content/browser.js
@@ -9518,6 +9518,14 @@ if (AppConstants.NIGHTLY_BUILD) {
         return;
       }
 
+      const openNonFissionWindowOption = Services.prefs.getBoolPref(
+        "fission.openNonFissionWindowOption",
+        false
+      );
+      if (!openNonFissionWindowOption) {
+        return;
+      }
+
       let newFissionWindow = document.getElementById("Tools:FissionWindow");
       let newNonFissionWindow = document.getElementById(
         "Tools:NonFissionWindow"
diff --git a/modules/libpref/init/StaticPrefList.yaml b/modules/libpref/init/StaticPrefList.yaml
index 8d8627401089..8c4146ef1b88 100644
--- a/modules/libpref/init/StaticPrefList.yaml
+++ b/modules/libpref/init/StaticPrefList.yaml
@@ -3612,6 +3612,13 @@
   value: true
   mirror: always
 
+# If true, show option for opening a non-Fission window in a menu, when Fission
+# is enabled.
+- name: fission.openNonFissionWindowOption
+  type: bool
+  value: false
+  mirror: always
+
 #---------------------------------------------------------------------------
 # Prefs starting with "font."
 #---------------------------------------------------------------------------