diff --git a/.gitignore b/.gitignore
index 4b0d985..a082d4f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -432,3 +432,4 @@ firefox-3.6.4.source.tar.bz2
 /firefox-langpacks-82.0.3-20201109.tar.xz
 /firefox-83.0.source.tar.xz
 /firefox-langpacks-83.0-20201112.tar.xz
+/firefox-langpacks-83.0-20201116.tar.xz
diff --git a/firefox.spec b/firefox.spec
index 1d6f87b..f3a18cb 100644
--- a/firefox.spec
+++ b/firefox.spec
@@ -3,7 +3,7 @@
 %global debug_build       0
 %global build_with_clang  0
 %global build_with_asan   0
-%global run_tests         1
+%global run_tests         0
 %global create_debuginfo  1
 %global system_nss        1
 
@@ -982,7 +982,7 @@ gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
 
 %changelog
 * Fri Nov 13 2020 Martin Stransky <stransky@redhat.com> - 83.0-2
-- Build with enabled tests
+- Updated to 83.0 Build 2
 
 * Thu Nov 12 2020 Martin Stransky <stransky@redhat.com> - 83.0-1
 - Updated to 83.0
diff --git a/run-tests b/run-tests
index e88877b..c008fa0 100755
--- a/run-tests
+++ b/run-tests
@@ -8,19 +8,18 @@ ln -s /usr/bin/certutil objdir/dist/bin/certutil
 ln -s /usr/bin/pk12util objdir/dist/bin/pk12util
 
 mkdir test_results
-objdir/dist/bin/jsapi-tests >& test_results/check-jsapi || true &
-./mach cppunittest >& test_results/check-cppunittest || true &
-./mach gtest >& test_results/check-gtest || true &
-./mach rusttests >& test_results/check-rusttests || true &
-
-# We can't parallelize these tests
+objdir/dist/bin/jsapi-tests >& test_results/check-jsapi || true
+./mach cppunittest >& test_results/check-cppunittest || true
+./mach gtest >& test_results/check-gtest || true
+./mach rusttests >& test_results/check-rusttests || true
 ./mach jstests >& test_results/check-jstests || true
-./mach xpcshell-test >& test_results/check-xpcshell-test || true
+# this test fails to quit
+#xvfb-run ./mach xpcshell-test >& test_results/check-xpcshell-test || true
 xvfb-run ./mach jstestbrowser >& test_results/check-jstestbrowser || true
 xvfb-run ./mach crashtest >& test_results/check-crashtest || true
 xvfb-run ./mach marionette-test >& test_results/check-marionette-test || true
-xvfb-run ./mach reftest >& test_results/check-reftest || true
-xvfb-run ./mach mochitest >& test_results/check-mochitest || true
+xvfb-run ./mach reftest --run-tests-in-parallel >& test_results/check-reftest || true
+xvfb-run ./mach mochitest --quiet >& test_results/check-mochitest || true
 
 rm -f  objdir/dist/bin/certutil
 rm -f  objdir/dist/bin/pk12util
diff --git a/sources b/sources
index f4b9254..7b5b69d 100644
--- a/sources
+++ b/sources
@@ -1,3 +1,3 @@
-SHA512 (firefox-83.0.source.tar.xz) = 2d0cbc1b778bec6981586ea18e9558356e58678bda05efda0f4ea32f85942bfca35bfa00a28ca7be83a9ade679184394209abb53c38df3ef912d14d000df8fc8
-SHA512 (firefox-langpacks-83.0-20201112.tar.xz) = 7c8999bcdfcd1b23a7593233fec39ea617fd591ff887226feb87c5b3557749745cf6f2aa411a75a6f674423cd511effd8266e8fe76122b21536a4133325dee5c
 SHA512 (cbindgen-vendor.tar.xz) = 3c925c5523246b7dfbcb4ce563483d5b45315a06dc90f2cf07cddef0c263dd15b410afbbe4d86594de96a308e93be3b27ffec01f5f759a42ecba3cc983b1677f
+SHA512 (firefox-83.0.source.tar.xz) = 4ac49cefed278d1f898907bbedacf81ea4bb4e5784f567d4c0971d9cbc2cf4a2e4472de81a7ded620bc3a516bc972d600b516b7674319cdfc9734c3824a9a2f6
+SHA512 (firefox-langpacks-83.0-20201116.tar.xz) = 0d26660a7f09481e82d8d88ac43917001301d422a94dc48d3913dff92805f100221ca6db15fea05e895221efe5a9d74c07780a671aebc26a69d7a588e1cd423d