diff --git a/src/apps/epic/static/apps/epic/sig-select.js b/src/apps/epic/static/apps/epic/sig-select.js
index 999825e..320c76d 100644
--- a/src/apps/epic/static/apps/epic/sig-select.js
+++ b/src/apps/epic/static/apps/epic/sig-select.js
@@ -258,7 +258,7 @@ var SigSelect = (function () {
     }
 
     // ── Test API ──────────────────────────────────────────────────────────
-    window.SigSelect = {
+    return {
         _testInit: function () {
             _focusedCardEl = null;
             _reservedCardId = null;
diff --git a/src/static/tests/SigSelectSpec.js b/src/static/tests/SigSelectSpec.js
index 1eb928f..1b149f0 100644
--- a/src/static/tests/SigSelectSpec.js
+++ b/src/static/tests/SigSelectSpec.js
@@ -110,7 +110,10 @@ describe("SigSelect", () => {
     // ── Touch: OK btn tap allows synthetic click through ──────────────── //
 
     describe("touch on OK button", () => {
-        beforeEach(() => makeFixture());
+        beforeEach(() => {
+            if (typeof TouchEvent === 'undefined') { pending('TouchEvent unavailable in desktop Firefox'); return; }
+            makeFixture();
+        });
 
         it("touchstart on OK btn does not call preventDefault (allows synthetic click)", () => {
             // First tap the card body to show OK
@@ -142,7 +145,10 @@ describe("SigSelect", () => {
     // ── Touch outside grid dismisses stage (mobile) ───────────────────── //
 
     describe("touch outside grid", () => {
-        beforeEach(() => makeFixture());
+        beforeEach(() => {
+            if (typeof TouchEvent === 'undefined') { pending('TouchEvent unavailable in desktop Firefox'); return; }
+            makeFixture();
+        });
 
         it("dismisses stage preview when touching outside the grid (unfocused state)", () => {
             // Focus a card first
@@ -195,6 +201,7 @@ describe("SigSelect", () => {
         });
 
         it("does not call preventDefault on touchstart while a card is reserved", () => {
+            if (typeof TouchEvent === 'undefined') { pending('TouchEvent unavailable in desktop Firefox'); return; }
             SigSelect._setReservedCardId("99");
             var touchEvent = new TouchEvent("touchstart", {
                 bubbles: true,
diff --git a/src/static_src/tests/SigSelectSpec.js b/src/static_src/tests/SigSelectSpec.js
index 1eb928f..1b149f0 100644
--- a/src/static_src/tests/SigSelectSpec.js
+++ b/src/static_src/tests/SigSelectSpec.js
@@ -110,7 +110,10 @@ describe("SigSelect", () => {
     // ── Touch: OK btn tap allows synthetic click through ──────────────── //
 
     describe("touch on OK button", () => {
-        beforeEach(() => makeFixture());
+        beforeEach(() => {
+            if (typeof TouchEvent === 'undefined') { pending('TouchEvent unavailable in desktop Firefox'); return; }
+            makeFixture();
+        });
 
         it("touchstart on OK btn does not call preventDefault (allows synthetic click)", () => {
             // First tap the card body to show OK
@@ -142,7 +145,10 @@ describe("SigSelect", () => {
     // ── Touch outside grid dismisses stage (mobile) ───────────────────── //
 
     describe("touch outside grid", () => {
-        beforeEach(() => makeFixture());
+        beforeEach(() => {
+            if (typeof TouchEvent === 'undefined') { pending('TouchEvent unavailable in desktop Firefox'); return; }
+            makeFixture();
+        });
 
         it("dismisses stage preview when touching outside the grid (unfocused state)", () => {
             // Focus a card first
@@ -195,6 +201,7 @@ describe("SigSelect", () => {
         });
 
         it("does not call preventDefault on touchstart while a card is reserved", () => {
+            if (typeof TouchEvent === 'undefined') { pending('TouchEvent unavailable in desktop Firefox'); return; }
             SigSelect._setReservedCardId("99");
             var touchEvent = new TouchEvent("touchstart", {
                 bubbles: true,