diff --git a/firefox-37-build-with-time-independent-uuids.patch b/firefox-37-build-with-time-independent-uuids.patch
new file mode 100644
index 0000000..3b9c8e6
--- /dev/null
+++ b/firefox-37-build-with-time-independent-uuids.patch
@@ -0,0 +1,12 @@
+diff -ur mozilla-release/python/mach/mach/main.py mozilla-release.new/python/mach/mach/main.py
+--- mozilla-release/python/mach/mach/main.py	2015-04-03 05:30:08.000000000 +0300
++++ mozilla-release.new/python/mach/mach/main.py	2015-04-20 13:03:05.743443939 +0300
+@@ -261,7 +261,7 @@
+                 mod = imp.new_module(b'mach.commands')
+                 sys.modules[b'mach.commands'] = mod
+ 
+-            module_name = 'mach.commands.%s' % uuid.uuid1().get_hex()
++            module_name = 'mach.commands.%s' % uuid.uuid4().get_hex()
+ 
+         imp.load_source(module_name, path)
+ 
diff --git a/firefox.spec b/firefox.spec
index d8219f4..ca7cd75 100644
--- a/firefox.spec
+++ b/firefox.spec
@@ -56,6 +56,7 @@ Patch11:	firefox-37-kde.patch
 Patch12:	mozilla-37-kde.patch
 #Patch13:	mozilla-kde-background.patch
 Patch34:	xulrunner_nojit.patch
+Patch35:	firefox-37-build-with-time-independent-uuids.patch
 
 # Fedora specific patches
 # Unable to install addons from https pages
@@ -179,6 +180,7 @@ Files and macros mainly for building Firefox extensions.
 %patch34 -p1
 %endif
 %endif
+%patch35 -p1
 
 # Fedora patches
 %patch204 -p2 -b .966424