diff --git a/MozillaFirefox.changes b/MozillaFirefox.changes
index 8108d4e..9c91b3e 100644
--- a/MozillaFirefox.changes
+++ b/MozillaFirefox.changes
@@ -1,7 +1,7 @@
 -------------------------------------------------------------------
 Sun Oct 19 12:59:28 UTC 2014 - vindex17@outlook.it
 
-- restore the default "-O2" flag for x86_64 CPUs
+- use Firefox default optimization flags instead of -Os
 - specfile cleanup
 
 -------------------------------------------------------------------
diff --git a/MozillaFirefox.spec b/MozillaFirefox.spec
index f1a1a63..cdb1378 100644
--- a/MozillaFirefox.spec
+++ b/MozillaFirefox.spec
@@ -17,11 +17,13 @@
 #
 
 
+# changed with every update
 %define major 33
 %define mainver %major.0
 %define update_channel release
 %define releasedate 2014101000
 
+# general build definitions
 %define firefox_appid \{ec8030f7-c20a-464f-9b0e-13a3a9e97384\}
 %define _use_internal_dependency_generator 0
 %define __find_requires sh %{SOURCE4}
@@ -35,7 +37,14 @@
 %else
 %define desktop_file_name %{name}
 %endif
-### build options
+%if 0%{?suse_version} > 1210
+%if 0%{?suse_version} > 1310
+%define gstreamer_ver 1.0
+%define gstreamer 1
+%else
+%define gstreamer_ver 0.10
+%endif
+%endif
 # Set up Google API keys, see http://www.chromium.org/developers/how-tos/api-keys
 # Note: these are for the openSUSE Firefox builds ONLY. For your own distribution,
 # please get your own set of keys.
@@ -47,8 +56,6 @@
 %else
 %define crashreporter 1
 %endif
-### build options end
-
 %if 0%{?suse_version} > 1210
 %if 0%{?suse_version} > 1310
 %define gstreamer_ver 1.0
@@ -285,11 +292,7 @@ export MOZILLA_OFFICIAL=1
 export BUILD_OFFICIAL=1
 export MOZ_TELEMETRY_REPORTING=1
 export MOZ_GOOGLE_API_KEY=%{_google_api_key}
-%ifarch x86_64
 export CFLAGS="$RPM_OPT_FLAGS -fno-strict-aliasing"
-%else
-export CFLAGS="$RPM_OPT_FLAGS -Os -fno-strict-aliasing"
-%endif
 %ifarch %arm
 export CFLAGS="${CFLAGS/-g / }"
 %endif
@@ -529,6 +532,12 @@ if [ -e dist/*symbols.zip ]; then
 fi
 %endif
 
+%clean
+rm -rf %{buildroot}
+%if %localize
+rm -rf %{_tmppath}/translations.*
+%endif
+
 %post
 # update mime and desktop database
 %if 0%{?suse_version} > 1130