diff --git a/browser_patches/firefox-beta/BUILD_NUMBER b/browser_patches/firefox-beta/BUILD_NUMBER
index 3bd255f39d..9e1a310b4e 100644
--- a/browser_patches/firefox-beta/BUILD_NUMBER
+++ b/browser_patches/firefox-beta/BUILD_NUMBER
@@ -1,2 +1,2 @@
-1301
-Changed: max@schmitt.mx Mon  1 Nov 2021 16:28:05 CET
+1302
+Changed: yurys@chromium.org Mon 01 Nov 2021 05:04:30 PM PDT
diff --git a/browser_patches/firefox-beta/juggler/screencast/nsScreencastService.cpp b/browser_patches/firefox-beta/juggler/screencast/nsScreencastService.cpp
index c7c76ee3c7..a91450d797 100644
--- a/browser_patches/firefox-beta/juggler/screencast/nsScreencastService.cpp
+++ b/browser_patches/firefox-beta/juggler/screencast/nsScreencastService.cpp
@@ -159,6 +159,9 @@ class nsScreencastService::Session : public rtc::VideoSinkInterface<webrtc::Vide
   void OnRawFrame(uint8_t* videoFrame, size_t videoFrameStride, const webrtc::VideoCaptureCapability& frameInfo) override {
     int pageWidth = frameInfo.width - mMargin.LeftRight();
     int pageHeight = frameInfo.height - mMargin.TopBottom();
+    // Frame size is 1x1 when browser window is minimized.
+    if (pageWidth <= 1 || pageHeight <= 1)
+      return;
     // Headed Firefox brings sizes in sync slowly.
     if (mViewportWidth && pageWidth > mViewportWidth)
       pageWidth = mViewportWidth;
diff --git a/browser_patches/firefox/BUILD_NUMBER b/browser_patches/firefox/BUILD_NUMBER
index 0f0bd7f455..5b7ee61244 100644
--- a/browser_patches/firefox/BUILD_NUMBER
+++ b/browser_patches/firefox/BUILD_NUMBER
@@ -1,2 +1,2 @@
-1299
-Changed: max@schmitt.mx Mon  1 Nov 2021 16:28:05 CET
+1300
+Changed: yurys@chromium.org Mon 01 Nov 2021 05:00:33 PM PDT
diff --git a/browser_patches/firefox/juggler/screencast/nsScreencastService.cpp b/browser_patches/firefox/juggler/screencast/nsScreencastService.cpp
index c7c76ee3c7..a91450d797 100644
--- a/browser_patches/firefox/juggler/screencast/nsScreencastService.cpp
+++ b/browser_patches/firefox/juggler/screencast/nsScreencastService.cpp
@@ -159,6 +159,9 @@ class nsScreencastService::Session : public rtc::VideoSinkInterface<webrtc::Vide
   void OnRawFrame(uint8_t* videoFrame, size_t videoFrameStride, const webrtc::VideoCaptureCapability& frameInfo) override {
     int pageWidth = frameInfo.width - mMargin.LeftRight();
     int pageHeight = frameInfo.height - mMargin.TopBottom();
+    // Frame size is 1x1 when browser window is minimized.
+    if (pageWidth <= 1 || pageHeight <= 1)
+      return;
     // Headed Firefox brings sizes in sync slowly.
     if (mViewportWidth && pageWidth > mViewportWidth)
       pageWidth = mViewportWidth;