From: Wolfgang Rosenauer, Tristan Miller
Subject: Do not use gconf for proxy settings if not running within Gnome

diff -ruN seamonkey-2.53.17b1.orig/toolkit/system/unixproxy/nsUnixSystemProxySettings.cpp seamonkey-2.53.17b1/toolkit/system/unixproxy/nsUnixSystemProxySettings.cpp
--- seamonkey-2.53.17b1.orig/toolkit/system/unixproxy/nsUnixSystemProxySettings.cpp	2023-06-10 12:41:26.000000000 +0200
+++ seamonkey-2.53.17b1/toolkit/system/unixproxy/nsUnixSystemProxySettings.cpp	2023-07-12 09:41:08.047344985 +0200
@@ -55,10 +55,14 @@
 nsresult
 nsUnixSystemProxySettings::Init()
 {
-  mGSettings = do_GetService(NS_GSETTINGSSERVICE_CONTRACTID);
-  if (mGSettings) {
-    mGSettings->GetCollectionForSchema(NS_LITERAL_CSTRING("org.gnome.system.proxy"),
-                                       getter_AddRefs(mProxySettings));
+  // only use GSettings if that is a GNOME session
+  const char* sessionType = PR_GetEnv("DESKTOP_SESSION");
+  if (sessionType && !strcmp(sessionType, "gnome")) {
+    mGSettings = do_GetService(NS_GSETTINGSSERVICE_CONTRACTID);
+    if (mGSettings) {
+      mGSettings->GetCollectionForSchema(NS_LITERAL_CSTRING("org.gnome.system.proxy"),
+                                         getter_AddRefs(mProxySettings));
+    }
   }
 
   return NS_OK;