diff --git a/app/scripts/background.js b/app/scripts/background.js
index 2f8d40ea0..6267c4441 100644
--- a/app/scripts/background.js
+++ b/app/scripts/background.js
@@ -100,7 +100,7 @@ const initApp = async (remotePort) => {
   log.info('MetaMask initialization complete.');
 };
 
-if (isManifestV3()) {
+if (isManifestV3) {
   browser.runtime.onConnect.addListener(initApp);
 } else {
   // initialization flow
@@ -402,7 +402,7 @@ function setupController(initState, initLangCode, remoteSourcePort) {
   //
   // connect to other contexts
   //
-  if (isManifestV3() && remoteSourcePort) {
+  if (isManifestV3 && remoteSourcePort) {
     connectRemote(remoteSourcePort);
   }
 
@@ -476,7 +476,7 @@ function setupController(initState, initLangCode, remoteSourcePort) {
       controller.isClientOpen = true;
       controller.setupTrustedCommunication(portStream, remotePort.sender);
 
-      if (isManifestV3()) {
+      if (isManifestV3) {
         // Message below if captured by UI code in app/scripts/ui.js which will trigger UI initialisation
         // This ensures that UI is initialised only after background is ready
         // It fixes the issue of blank screen coming when extension is loaded, the issue is very frequent in MV3
@@ -605,7 +605,7 @@ function setupController(initState, initLangCode, remoteSourcePort) {
       label = String(count);
     }
     // browserAction has been replaced by action in MV3
-    if (isManifestV3()) {
+    if (isManifestV3) {
       browser.action.setBadgeText({ text: label });
       browser.action.setBadgeBackgroundColor({ color: '#037DD6' });
     } else {
diff --git a/app/scripts/contentscript.js b/app/scripts/contentscript.js
index 7810bd8e7..a6fb3bcd1 100644
--- a/app/scripts/contentscript.js
+++ b/app/scripts/contentscript.js
@@ -44,7 +44,7 @@ if (
 ) {
   setupPhishingStream();
 } else if (shouldInjectProvider()) {
-  if (!isManifestV3()) {
+  if (!isManifestV3) {
     injectScript(inpageBundle);
   }
   setupStreams();
diff --git a/app/scripts/ui.js b/app/scripts/ui.js
index 50c94cc08..5d7a0c181 100644
--- a/app/scripts/ui.js
+++ b/app/scripts/ui.js
@@ -35,7 +35,7 @@ const WORKER_KEEP_ALIVE_MESSAGE = 'WORKER_KEEP_ALIVE_MESSAGE';
  * if service worker is inactive it is reactivated and script re-loaded
  * Time has been kept to 1000ms but can be reduced for even faster re-activation of service worker
  */
-if (isManifestV3()) {
+if (isManifestV3) {
   setInterval(() => {
     browser.runtime.sendMessage({ name: WORKER_KEEP_ALIVE_MESSAGE });
   }, WORKER_KEEP_ALIVE_INTERVAL);
@@ -62,7 +62,7 @@ async function start() {
    * In case of MV3 the issue of blank screen was very frequent, it is caused by UI initialising before background is ready to send state.
    * Code below ensures that UI is rendered only after background is ready.
    */
-  if (isManifestV3()) {
+  if (isManifestV3) {
     /*
      * In case of MV3 the issue of blank screen was very frequent, it is caused by UI initialising before background is ready to send state.
      * Code below ensures that UI is rendered only after CONNECTION_READY message is received thus background is ready.
diff --git a/shared/modules/mv3.utils.js b/shared/modules/mv3.utils.js
index a990075b6..3f9388b07 100644
--- a/shared/modules/mv3.utils.js
+++ b/shared/modules/mv3.utils.js
@@ -1,4 +1,4 @@
 import browser from 'webextension-polyfill';
 
-export const isManifestV3 = () =>
+export const isManifestV3 =
   browser.runtime.getManifest().manifest_version === 3;
diff --git a/test/helpers/setup-helper.js b/test/helpers/setup-helper.js
index 0e3887e3e..ae38d0c9f 100644
--- a/test/helpers/setup-helper.js
+++ b/test/helpers/setup-helper.js
@@ -6,7 +6,9 @@ import { JSDOM } from 'jsdom';
 
 process.env.IN_TEST = true;
 
-global.chrome = { runtime: { id: 'testid' } };
+global.chrome = {
+  runtime: { id: 'testid', getManifest: () => ({ manifest_version: 2 }) },
+};
 
 nock.disableNetConnect();
 nock.enableNetConnect('localhost');
diff --git a/ui/__mocks__/webextension-polyfill.js b/ui/__mocks__/webextension-polyfill.js
index 54e90aa25..0984c767d 100644
--- a/ui/__mocks__/webextension-polyfill.js
+++ b/ui/__mocks__/webextension-polyfill.js
@@ -1,3 +1,3 @@
 module.exports = {
-  runtime: {},
+  runtime: { getManifest: () => ({ manifest_version: 2 }) },
 };