diff --git a/browser/config/mozconfigs/macosx64/beta b/browser/config/mozconfigs/macosx64/beta
index 11b54ad546a5..bbd4cc189617 100644
--- a/browser/config/mozconfigs/macosx64/beta
+++ b/browser/config/mozconfigs/macosx64/beta
@@ -7,6 +7,4 @@ fi
 ac_add_options --enable-official-branding
 ac_add_options --enable-verify-mar
 
-ac_add_options --enable-lto
-
 . "$topsrcdir/build/mozconfig.common.override"
diff --git a/browser/config/mozconfigs/macosx64/nightly b/browser/config/mozconfigs/macosx64/nightly
index 4e6d00f27523..e75edbadaa60 100644
--- a/browser/config/mozconfigs/macosx64/nightly
+++ b/browser/config/mozconfigs/macosx64/nightly
@@ -9,8 +9,6 @@ if test `uname -s` != Linux; then
   ac_add_options --enable-dtrace
 fi
 
-ac_add_options --enable-lto
-
 ac_add_options --with-branding=browser/branding/nightly
 
 . "$topsrcdir/build/mozconfig.common.override"
diff --git a/browser/config/mozconfigs/macosx64/release b/browser/config/mozconfigs/macosx64/release
index 1c5c3f93752e..d0945af0cd33 100644
--- a/browser/config/mozconfigs/macosx64/release
+++ b/browser/config/mozconfigs/macosx64/release
@@ -10,8 +10,6 @@ fi
 ac_add_options --enable-official-branding
 ac_add_options --enable-verify-mar
 
-ac_add_options --enable-lto
-
 # safeguard against someone forgetting to re-set EARLY_BETA_OR_EARLIER in
 # defines.sh during the beta cycle
 export BUILDING_RELEASE=1
diff --git a/taskcluster/ci/build/macosx.yml b/taskcluster/ci/build/macosx.yml
index 02b172cfc116..665cb18e78a6 100644
--- a/taskcluster/ci/build/macosx.yml
+++ b/taskcluster/ci/build/macosx.yml
@@ -49,7 +49,7 @@ macosx64/opt:
         tier: 1
     worker-type: aws-provisioner-v1/gecko-{level}-b-linux
     worker:
-        max-run-time: 7200
+        max-run-time: 3600
         env:
             TOOLTOOL_MANIFEST: "browser/config/tooltool-manifests/macosx64/cross-releng.manifest"
     run: