From 98edfc063bb5be5d9360799cef465ed1f4ef377d Mon Sep 17 00:00:00 2001
From: Samuel FORESTIER <samuel+dev@forestier.app>
Date: Sat, 1 Aug 2026 17:02:09 +0200
Subject: [PATCH] Enforces "mailnews.oauth.useExternalBrowser" and
 "mailnews.oauth.useSchemeRedirect"

---
 user.js | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/user.js b/user.js
index 944643f..aa81165 100644
--- a/user.js
+++ b/user.js
@@ -941,6 +941,10 @@ user_pref("browser.pagethumbnails.capturing_disabled", true); // [HIDDEN PREF]
  * many users could suffer from this we keep this it disabled, feel free to switch it on if yours
  * supports it. */
    // user_pref("mailnews.oauth.usePrivateBrowser", true);
+/* 5902: Prefer system browser for OAuth instead of Thunderbird ***/
+user_pref("mailnews.oauth.useExternalBrowser", true); // [DEFAULT: true]
+/* 5903: Prefer "net.thunderbird:" URL scheme instead of "localhost" address for OAuth redirection ***/
+user_pref("mailnews.oauth.useSchemeRedirect", true);  // [DEFAULT: true]
 
 /*** [SECTION 5500]: OPTIONAL HARDENING
    Thunderbird-User.JS maintainer here :