diff --git a/browser_patches/firefox/BUILD_NUMBER b/browser_patches/firefox/BUILD_NUMBER
index 02238fc1d4..50abca2bdc 100644
--- a/browser_patches/firefox/BUILD_NUMBER
+++ b/browser_patches/firefox/BUILD_NUMBER
@@ -1,2 +1,2 @@
-1266
-Changed: max@schmitt.mx Thu May 20 19:02:11 UTC 2021
+1267
+Changed: lushnikov@chromium.org Thu 20 May 2021 03:27:19 PM PDT
diff --git a/browser_patches/firefox/UPSTREAM_CONFIG.sh b/browser_patches/firefox/UPSTREAM_CONFIG.sh
index c94dc6b577..ce173bc22b 100644
--- a/browser_patches/firefox/UPSTREAM_CONFIG.sh
+++ b/browser_patches/firefox/UPSTREAM_CONFIG.sh
@@ -1,3 +1,3 @@
 REMOTE_URL="https://github.com/mozilla/gecko-dev"
 BASE_BRANCH="beta"
-BASE_REVISION="8596b58aaea60b1bd772f9e4c5e57416eee9ff1d"
+BASE_REVISION="d63e947e90d616f3188e0dcdfd7b8113340a18d5"
diff --git a/browser_patches/firefox/patches/bootstrap.diff b/browser_patches/firefox/patches/bootstrap.diff
index e395175f80..ad6d5f91c0 100644
--- a/browser_patches/firefox/patches/bootstrap.diff
+++ b/browser_patches/firefox/patches/bootstrap.diff
@@ -92,7 +92,7 @@ index 4fa1d742bd5e0c03b1c93b8bf7cca2fcc8cbded1..1af645fdb86c4a803e1a5f0be08c1d09
    DWORD creationFlags = CREATE_SUSPENDED | CREATE_UNICODE_ENVIRONMENT;
  
 diff --git a/browser/installer/allowed-dupes.mn b/browser/installer/allowed-dupes.mn
-index b4b279cf69968e79b8612b5875961511b4aa2e99..45cc1d3200e975b14d74e2b1b245732e55ea89a8 100644
+index 64ab6ca6f2dc5c6e83e0bbbc168f173826e0a43c..95f63c914adcebff0b4ab4ada60750549b57d76b 100644
 --- a/browser/installer/allowed-dupes.mn
 +++ b/browser/installer/allowed-dupes.mn
 @@ -65,6 +65,12 @@ browser/defaults/settings/main/example.json