diff --git a/app/scripts/services/oauth/oauth-service.ts b/app/scripts/services/oauth/oauth-service.ts
index 52a2925a0049..c343d103e57c 100644
--- a/app/scripts/services/oauth/oauth-service.ts
+++ b/app/scripts/services/oauth/oauth-service.ts
@@ -1,6 +1,9 @@
 import { AuthConnection } from '@metamask/seedless-onboarding-controller';
 import log from 'loglevel';
-import { OAuthErrorMessages } from '../../../../shared/modules/error';
+import {
+  isUserCancelledLoginError,
+  OAuthErrorMessages,
+} from '../../../../shared/modules/error';
 import { checkForLastError } from '../../../../shared/modules/browser-runtime.utils';
 import { TraceName, TraceOperation } from '../../../../shared/lib/trace';
 import { BaseLoginHandler } from './base-login-handler';
@@ -204,12 +207,13 @@ export default class OAuthService {
                   reject(error);
                 }
               } else {
-                if (this.#isUserCancelledLoginError()) {
-                  reject(
-                    new Error(OAuthErrorMessages.USER_CANCELLED_LOGIN_ERROR),
-                  );
+                const userCancelledLoginError =
+                  this.#getUserCancelledLoginError();
+                if (userCancelledLoginError) {
+                  reject(userCancelledLoginError);
                   return;
                 }
+                // Throw default error for no redirect URL found
                 reject(
                   new Error(OAuthErrorMessages.NO_REDIRECT_URL_FOUND_ERROR),
                 );
@@ -357,9 +361,12 @@ export default class OAuthService {
     return url.searchParams.get('code');
   }
 
-  #isUserCancelledLoginError(): boolean {
+  #getUserCancelledLoginError(): Error | undefined {
     const error = checkForLastError();
-    return error?.message === OAuthErrorMessages.USER_CANCELLED_LOGIN_ERROR;
+    if (isUserCancelledLoginError(error)) {
+      return error;
+    }
+    return undefined;
   }
 
   async setMarketingConsent(
diff --git a/shared/modules/error.ts b/shared/modules/error.ts
index 10d28b2f148c..f86c18e90366 100644
--- a/shared/modules/error.ts
+++ b/shared/modules/error.ts
@@ -39,6 +39,9 @@ export enum OAuthErrorMessages {
   USER_CANCELLED_LOGIN_ERROR = 'The user did not approve access.',
   // TODO: Fix in https://github.com/MetaMask/metamask-extension/issues/31860
   // eslint-disable-next-line @typescript-eslint/naming-convention
+  USER_CANCELLED_LOGIN_ERROR_FIREFOX = 'User cancelled or denied access.',
+  // TODO: Fix in https://github.com/MetaMask/metamask-extension/issues/31860
+  // eslint-disable-next-line @typescript-eslint/naming-convention
   NO_REDIRECT_URL_FOUND_ERROR = 'No redirect URL found',
   // TODO: Fix in https://github.com/MetaMask/metamask-extension/issues/31860
   // eslint-disable-next-line @typescript-eslint/naming-convention
@@ -47,3 +50,17 @@ export enum OAuthErrorMessages {
   // eslint-disable-next-line @typescript-eslint/naming-convention
   INVALID_OAUTH_STATE_ERROR = 'Invalid OAuth state',
 }
+
+/**
+ * Checks if the Web Authentication error is a user cancelled error.
+ *
+ * @param error - The error to check.
+ * @returns True if the error is a user cancelled login error, false otherwise.
+ */
+export function isUserCancelledLoginError(error: Error | undefined): boolean {
+  // NOTE: Firefox and chrome have different error messages for user cancelled the social login window.
+  return (
+    error?.message === OAuthErrorMessages.USER_CANCELLED_LOGIN_ERROR ||
+    error?.message === OAuthErrorMessages.USER_CANCELLED_LOGIN_ERROR_FIREFOX
+  );
+}
diff --git a/ui/pages/onboarding-flow/welcome/welcome.js b/ui/pages/onboarding-flow/welcome/welcome.js
index c4514d92c69b..f3b60fe11fd2 100644
--- a/ui/pages/onboarding-flow/welcome/welcome.js
+++ b/ui/pages/onboarding-flow/welcome/welcome.js
@@ -8,7 +8,6 @@ import React, {
 } from 'react';
 import { useDispatch, useSelector } from 'react-redux';
 import { useNavigate } from 'react-router-dom-v5-compat';
-import log from 'loglevel';
 import { Box } from '../../../components/component-library';
 import {
   ONBOARDING_COMPLETION_ROUTE,
@@ -41,7 +40,10 @@ import {
 import { getIsSeedlessOnboardingFeatureEnabled } from '../../../../shared/modules/environment';
 import { getBrowserName } from '../../../../shared/modules/browser-runtime.utils';
 import { PLATFORM_FIREFOX } from '../../../../shared/constants/app';
-import { OAuthErrorMessages } from '../../../../shared/modules/error';
+import {
+  isUserCancelledLoginError,
+  OAuthErrorMessages,
+} from '../../../../shared/modules/error';
 import { TraceName, TraceOperation } from '../../../../shared/lib/trace';
 import {
   AlignItems,
@@ -214,7 +216,7 @@ export default function OnboardingWelcome() {
         error instanceof Error ? error.message : 'Unknown error';
 
       // Map raw OAuth error messages to UI modal-friendly constants
-      if (errorMessage === OAuthErrorMessages.USER_CANCELLED_LOGIN_ERROR) {
+      if (isUserCancelledLoginError(error)) {
         setLoginError(null);
         return;
       }
@@ -354,9 +356,7 @@ export default function OnboardingWelcome() {
   );
 
   const handleLoginError = useCallback((error) => {
-    log.error('handleLoginError::error', error);
-    const errorMessage = error.message;
-    if (errorMessage === OAuthErrorMessages.USER_CANCELLED_LOGIN_ERROR) {
+    if (isUserCancelledLoginError(error)) {
       setLoginError(null);
     } else {
       setLoginError(LOGIN_ERROR.GENERIC);