diff --git a/firefox-esr.changes b/firefox-esr.changes
index 13cb473..0ad2e8a 100644
--- a/firefox-esr.changes
+++ b/firefox-esr.changes
@@ -6,6 +6,8 @@ Mon Oct 21 13:13:29 UTC 2019 - Wolfgang Rosenauer <wr@rosenauer.org>
     mozilla-bmo1573381.patch
     mozilla-bmo1512162.patch
     mozilla-bmo1585099.patch
+- added mozilla-sle12-lower-python-requirement.patch to support
+  SLE12 still
 
 -------------------------------------------------------------------
 Wed Oct  2 21:08:05 UTC 2019 - Wolfgang Rosenauer <wr@rosenauer.org>
diff --git a/firefox-esr.spec b/firefox-esr.spec
index fcdbaf4..ecfa1c4 100644
--- a/firefox-esr.spec
+++ b/firefox-esr.spec
@@ -16,6 +16,8 @@
 # Please submit bugfixes or comments via https://bugs.opensuse.org/
 #
 
+# either MozillaFirefox or firefox-esr
+%define pkgname  firefox-esr
 
 # changed with every update
 # orig_version vs. mainver: To have beta-builds
@@ -50,10 +52,15 @@ BuildArch:      i686
 %endif
 
 # general build definitions
+%if %{pkgname} == "firefox-esr"
 %define progname firefox-esr
-%define pkgname  firefox-esr
-%define srcname  firefox
 %define appname  Firefox ESR
+%else
+%define progname firefox
+%define appname  Firefox
+%endif
+
+%define srcname  firefox
 %define progdir %{_prefix}/%_lib/%{progname}
 %define gnome_dir     %{_prefix}
 %define desktop_file_name %{progname}
@@ -94,13 +101,14 @@ BuildRequires:  mozilla-nss-devel >= 3.44.1
 BuildRequires:  firefox-nasm >= 2.13
 BuildRequires:  nodejs10
 #BuildRequires:  python2-xml
-BuildRequires:  firefox-python3 >= 3.5
 %else
 BuildRequires:  nasm >= 2.13
 BuildRequires:  nodejs8 >= 8.11
 BuildRequires:  python2-xml
-BuildRequires:  python3 >= 3.5
 %endif
+# Official requirement is 3.5, but for SLE-12 we lower (patch) the
+# requirement to 3.4, as thats the python-version we have there
+BuildRequires:  python3 >= 3.4
 BuildRequires:  python-devel
 BuildRequires:  rust >= 1.34
 BuildRequires:  rust-cbindgen >= 0.8.7
@@ -200,6 +208,7 @@ Patch20:        mozilla-bmo1511604.patch
 Patch21:        mozilla-bmo1554971.patch
 Patch22:        mozilla-nestegg-big-endian.patch
 Patch24:        mozilla-fix-top-level-asm.patch
+Patch25:        mozilla-sle12-lower-python-requirement.patch
 # Firefox/browser
 Patch101:       firefox-kde.patch
 Patch102:       firefox-branded-icons.patch
@@ -214,6 +223,9 @@ Recommends:     libcanberra0
 Recommends:     libpulse0
 # addon leads to startup crash (bnc#908892)
 Obsoletes:      tracker-miner-firefox < 0.15
+%if 0%{?devpkg} == 0
+Obsoletes:      %{name}-devel < %{version}
+%endif
 # libproxy's mozjs pacrunner crashes FF (bnc#759123)
 %if 0%{?suse_version} < 1220
 Obsoletes:      libproxy1-pacrunner-mozjs <= 0.4.7
@@ -334,6 +346,7 @@ cd $RPM_BUILD_DIR/%{srcname}-%{orig_version}
 %patch21 -p1
 %patch22 -p1
 %patch24 -p1
+%patch25 -p1
 # Firefox
 %patch101 -p1
 %patch102 -p1
@@ -513,8 +526,10 @@ cp -rf $RPM_BUILD_DIR/obj/dist/%{srcname}/* %{buildroot}%{progdir}
 mkdir -p %{buildroot}%{progdir}/distribution/extensions
 mkdir -p %{buildroot}%{progdir}/browser/defaults/preferences/
 # renaming executables (for regular vs. ESR)
-mv %{buildroot}%{progdir}/firefox %{buildroot}%{progdir}/%{progname}
-mv %{buildroot}%{progdir}/firefox-bin %{buildroot}%{progdir}/%{progname}-bin
+%if "%{srcname}" != "%{progname}"
+mv %{buildroot}%{progdir}/%{srcname} %{buildroot}%{progdir}/%{progname}
+mv %{buildroot}%{progdir}/%{srcname}-bin %{buildroot}%{progdir}/%{progname}-bin
+%endif
 # install gre prefs
 install -m 644 %{SOURCE13} %{buildroot}%{progdir}/defaults/pref/
 # install browser prefs
@@ -613,8 +628,8 @@ rm -f %{buildroot}%{progdir}/run-mozilla.sh
 rm -f %{buildroot}%{progdir}/LICENSE
 rm -f %{buildroot}%{progdir}/precomplete
 rm -f %{buildroot}%{progdir}/update-settings.ini
-# devel
 %if 0%{?devpkg}
+# devel
 mkdir -p %{buildroot}%{_bindir}
 install -m 755 %SOURCE12 %{buildroot}%{_bindir}
 # inspired by mandriva
diff --git a/mozilla-sle12-lower-python-requirement.patch b/mozilla-sle12-lower-python-requirement.patch
new file mode 100644
index 0000000..29d7b6c
--- /dev/null
+++ b/mozilla-sle12-lower-python-requirement.patch
@@ -0,0 +1,41 @@
+# HG changeset patch
+# Parent  9edebbc21d9835abacb6110b1591d2ae1b6a0727
+On SLE-12 we have only python 3.4 available at the moment. But
+as it seems, no python 3.5 features are being used to build, so
+lowering the requirements work.
+
+diff -r 9edebbc21d98 build/moz.configure/init.configure
+--- a/build/moz.configure/init.configure	Fri Sep 20 08:00:18 2019 +0200
++++ b/build/moz.configure/init.configure	Fri Oct 11 12:44:23 2019 +0200
+@@ -412,7 +412,7 @@
+                                   'MozillaBuild python: %s' % e)
+     else:
+         # Fall back to the search routine.
+-        python, version = find_python3_executable(min_version='3.5.0')
++        python, version = find_python3_executable(min_version='3.4.5')
+ 
+         # The API returns a bytes whereas everything in configure is unicode.
+         if python:
+@@ -424,7 +424,7 @@
+                               'PATH or define PYTHON3 to point to a Python '
+                               '3.5 executable.')
+ 
+-    if version < (3, 5, 0):
++    if version < (3, 4, 5):
+         raise FatalCheckError('Python 3.5 or newer is required to build; '
+                               '%s is Python %d.%d' % (python, version[0],
+                                                       version[1]))
+diff -r 9edebbc21d98 taskcluster/scripts/run-task
+--- a/taskcluster/scripts/run-task	Fri Sep 20 08:00:18 2019 +0200
++++ b/taskcluster/scripts/run-task	Fri Oct 11 12:44:23 2019 +0200
+@@ -16,8 +16,8 @@
+ import sys
+ 
+ 
+-if sys.version_info[0:2] < (3, 5):
+-    print('run-task requires Python 3.5+')
++if sys.version_info[0:2] < (3, 4):
++    print('run-task requires Python 3.4+')
+     sys.exit(1)
+ 
+