diff -r 4ba0eb6a14ca -r 571212dc4d05 mozilla-bmo1233434.patch
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mozilla-bmo1233434.patch	Sat Dec 26 13:34:28 2015 +0100
@@ -0,0 +1,45 @@
+
+# HG changeset patch
+# User Aidin Gharibnavaz <aidin@aidinhut.com>
+# Date 1450550460 -12600
+# Node ID 07ec362866977f37e638fc88e3079621fd7aef96
+# Parent  cb66ffeb6725e8344818e8e2f707ae2eaeb953b4
+Bug 1233434 - Fixing download failure on a multi-user GNU/Linux machine. r?bagder
+
+diff -r cb66ffeb6725 -r 07ec36286697 uriloader/exthandler/nsExternalHelperAppService.cpp
+--- a/uriloader/exthandler/nsExternalHelperAppService.cpp	Tue Dec 15 14:45:06 2015 +0100
++++ b/uriloader/exthandler/nsExternalHelperAppService.cpp	Sat Dec 19 22:11:00 2015 +0330
+@@ -416,12 +416,12 @@
+     const char* userName = PR_GetEnv("USERNAME");
+     if (!userName || !*userName) {
+       userName = PR_GetEnv("USER");
+-      if (!userName || !*userName) {
+-        userName = PR_GetEnv("LOGNAME");
+-      }
+-      else {
+-        userName = "mozillaUser";
+-      }
++    }
++    if (!userName || !*userName) {
++      userName = PR_GetEnv("LOGNAME");
++    }
++    if (!userName || !*userName) {
++      userName = "mozillaUser";
+     }
+ 
+     nsAutoString userDir;
+@@ -447,7 +447,12 @@
+         rv = finalPath->GetPermissions(&permissions);
+         NS_ENSURE_SUCCESS(rv, rv);
+ 
+-        if (permissions == PR_IRWXU) {
++        // Ensuring the path is writable by the current user.
++        bool isWritable;
++        rv = finalPath->IsWritable(&isWritable);
++        NS_ENSURE_SUCCESS(rv, rv);
++
++        if (permissions == PR_IRWXU && isWritable) {
+           dir = finalPath;
+           break;
+         }
+