diff --git a/browser_patches/firefox-beta/BUILD_NUMBER b/browser_patches/firefox-beta/BUILD_NUMBER
index d66d2bcf90..2e412584bf 100644
--- a/browser_patches/firefox-beta/BUILD_NUMBER
+++ b/browser_patches/firefox-beta/BUILD_NUMBER
@@ -1,2 +1,2 @@
-1263
-Changed: max@schmitt.mx Thu Jun 10 14:40:52 UTC 2021
+1264
+Changed: lushnikov@chromium.org Tue 15 Jun 2021 03:35:19 PM PDT
diff --git a/browser_patches/firefox-beta/UPSTREAM_CONFIG.sh b/browser_patches/firefox-beta/UPSTREAM_CONFIG.sh
index 23c42a2cb3..06b3f9f37b 100644
--- a/browser_patches/firefox-beta/UPSTREAM_CONFIG.sh
+++ b/browser_patches/firefox-beta/UPSTREAM_CONFIG.sh
@@ -1,3 +1,3 @@
 REMOTE_URL="https://github.com/mozilla/gecko-dev"
 BASE_BRANCH="beta"
-BASE_REVISION="8e61250282cc73e7f16a1e9d59e30223baa817c8"
+BASE_REVISION="546eb283b0f4f85899513eaac0e60665ab9c653b"
diff --git a/browser_patches/firefox-beta/patches/bootstrap.diff b/browser_patches/firefox-beta/patches/bootstrap.diff
index b904daef65..fb6202cd79 100644
--- a/browser_patches/firefox-beta/patches/bootstrap.diff
+++ b/browser_patches/firefox-beta/patches/bootstrap.diff
@@ -172,7 +172,7 @@ index 040c7b124dec6bb254563bbe74fe50012cb077a3..b4e6b8132786af70e8ad0dce88b67c28
    const transportProvider = {
      setListener(upgradeListener) {
 diff --git a/docshell/base/BrowsingContext.cpp b/docshell/base/BrowsingContext.cpp
-index e40855518df79fd7f8a3eb0d7195a87a1180157d..f8bba58dd2fc05ec0d2da3ec008523e214ab5a41 100644
+index 0093288d1a448afe7bd8e5b6e8c0cb31835ba3f5..93908f5719f2cb0fe2f58d7f3153a9af0e71f08b 100644
 --- a/docshell/base/BrowsingContext.cpp
 +++ b/docshell/base/BrowsingContext.cpp
 @@ -106,6 +106,20 @@ struct ParamTraits<mozilla::dom::PrefersColorSchemeOverride>
@@ -196,7 +196,7 @@ index e40855518df79fd7f8a3eb0d7195a87a1180157d..f8bba58dd2fc05ec0d2da3ec008523e2
  template <>
  struct ParamTraits<mozilla::dom::ExplicitActiveStatus>
      : public ContiguousEnumSerializer<
-@@ -2641,6 +2655,40 @@ void BrowsingContext::DidSet(FieldIndex<IDX_PrefersColorSchemeOverride>,
+@@ -2643,6 +2657,40 @@ void BrowsingContext::DidSet(FieldIndex<IDX_PrefersColorSchemeOverride>,
    });
  }