diff --git a/third_party/libwebrtc/README.moz-ff-commit b/third_party/libwebrtc/README.moz-ff-commit
index 870fb05b4ebb..86a220c01e4e 100644
--- a/third_party/libwebrtc/README.moz-ff-commit
+++ b/third_party/libwebrtc/README.moz-ff-commit
@@ -6174,3 +6174,6 @@ ab229b0706
 # MOZ_LIBWEBRTC_SRC=/home/mfroman/git-checkouts/trial-webrtc-builds/moz-libwebrtc-checkout/src MOZ_LIBWEBRTC_COMMIT=mjfdev bash dom/media/webrtc/third_party_build/fast-forward-libwebrtc.sh
 # base of lastest vendoring
 f3ff3c5b77
+# MOZ_LIBWEBRTC_SRC=/home/mfroman/git-checkouts/trial-webrtc-builds/moz-libwebrtc-checkout/src MOZ_LIBWEBRTC_COMMIT=mjfdev bash dom/media/webrtc/third_party_build/fast-forward-libwebrtc.sh
+# base of lastest vendoring
+2a25a96973
diff --git a/third_party/libwebrtc/README.mozilla b/third_party/libwebrtc/README.mozilla
index 89627c7eddbd..8b71f4309879 100644
--- a/third_party/libwebrtc/README.mozilla
+++ b/third_party/libwebrtc/README.mozilla
@@ -4118,3 +4118,5 @@ libwebrtc updated from /home/mfroman/git-checkouts/trial-webrtc-builds/moz-libwe
 libwebrtc updated from /home/mfroman/git-checkouts/trial-webrtc-builds/moz-libwebrtc-checkout/src commit mjfdev on 2022-05-26T20:57:22.025831.
 # python3 vendor-libwebrtc.py --from-local /home/mfroman/git-checkouts/trial-webrtc-builds/moz-libwebrtc-checkout/src --commit mjfdev libwebrtc
 libwebrtc updated from /home/mfroman/git-checkouts/trial-webrtc-builds/moz-libwebrtc-checkout/src commit mjfdev on 2022-05-26T20:58:03.238570.
+# python3 vendor-libwebrtc.py --from-local /home/mfroman/git-checkouts/trial-webrtc-builds/moz-libwebrtc-checkout/src --commit mjfdev libwebrtc
+libwebrtc updated from /home/mfroman/git-checkouts/trial-webrtc-builds/moz-libwebrtc-checkout/src commit mjfdev on 2022-05-26T20:58:45.564463.
diff --git a/third_party/libwebrtc/video/adaptation/overuse_frame_detector_unittest.cc b/third_party/libwebrtc/video/adaptation/overuse_frame_detector_unittest.cc
index d4bf910faa6e..d95ce0f32400 100644
--- a/third_party/libwebrtc/video/adaptation/overuse_frame_detector_unittest.cc
+++ b/third_party/libwebrtc/video/adaptation/overuse_frame_detector_unittest.cc
@@ -455,6 +455,8 @@ TEST_F(OveruseFrameDetectorTest, RunOnTqNormalUsage) {
   EXPECT_TRUE(event.Wait(10000));
 }
 
+// TODO(crbug.com/webrtc/12846): investigate why the test fails on MAC bots.
+#if !defined(WEBRTC_MAC)
 TEST_F(OveruseFrameDetectorTest, MaxIntervalScalesWithFramerate) {
   const int kCapturerMaxFrameRate = 30;
   const int kEncodeMaxFrameRate = 20;  // Maximum fps the encoder can sustain.
@@ -490,6 +492,7 @@ TEST_F(OveruseFrameDetectorTest, MaxIntervalScalesWithFramerate) {
                                   processing_time_us);
   overuse_detector_->CheckForOveruse(observer_);
 }
+#endif
 
 TEST_F(OveruseFrameDetectorTest, RespectsMinFramerate) {
   const int kMinFrameRate = 7;  // Minimum fps allowed by current detector impl.
@@ -821,6 +824,8 @@ TEST_F(OveruseFrameDetectorTest2, ResetAfterFrameTimeout) {
   EXPECT_EQ(InitialUsage(), UsagePercent());
 }
 
+// TODO(crbug.com/webrtc/12846): investigate why the test fails on MAC bots.
+#if !defined(WEBRTC_MAC)
 TEST_F(OveruseFrameDetectorTest2, ConvergesSlowly) {
   overuse_detector_->SetOptions(options_);
   InsertAndSendFramesWithInterval(1, kFrameIntervalUs, kWidth, kHeight,
@@ -842,6 +847,7 @@ TEST_F(OveruseFrameDetectorTest2, ConvergesSlowly) {
                                   kProcessTimeUs);
   EXPECT_NEAR(UsagePercent(), 20, 5);
 }
+#endif
 
 TEST_F(OveruseFrameDetectorTest2, InitialProcessingUsage) {
   overuse_detector_->SetOptions(options_);