Windows 11 Pro, Version 25H2, Updated windows (include KB5074109) on Jan 16, 2026.
  Firefox version 107.0  

  Firefox freeze shortly (e.g. after play YouTube video for less than a couple minutes, just browser YouTube videos for a while, or just open about:preferences page).
  
  I installed  Firefox 147.0.1. Same issue. 

  Hover cursor to Firefox, it becomes busy (blue spinner)

  Note: Firefox works fine before the windows update. Chrome exits suddenly after the update too.

Environment: Windows 11 Pro, Version 25H2, Updated windows (include KB5074109) on Jan 16, 2026. Firefox version 107.0 Issue: Firefox freeze shortly (e.g. after play YouTube video for less than a couple minutes, just browser YouTube videos for a while, or just open about:preferences page). I installed Firefox 147.0.1. Same issue. Hover cursor to Firefox, it becomes busy (blue spinner) Note: Firefox works fine before the windows update. Chrome exits suddenly after the update too. Task Manager: shows 15 FireFox processors with 0% CPU usage. Event Viewer: Fault bucket 1541027055463960799, type 5 Event Name: AppHangB1 Response: Not available Cab Id: 0 Problem signature: P1: firefox.exe P2: 147.0.1.271 P3: 696a121b P4: 79cd P5: 67246080 P6: P7: P8: P9: P10: Attached files: \\?\C:\ProgramData\Microsoft\Windows\WER\Temp\WER.2bcf31a5-033f-4855-91a8-348910b535af.tmp.WERInternalMetadata.xml These files may be available here: \\?\C:\ProgramData\Microsoft\Windows\WER\ReportArchive\Critical_firefox.exe_a06ac11b8d36ddc3afaf533a3621d865d77465b2_0c016577_0f9df051-1632-43c0-8b21-1bdd35f2b339 Analysis symbol: Rechecking for solution: 0 Report Id: 4ecd169f-49c4-4d96-bd8d-324fc999200b Report Status: 268435456 Hashed bucket: 26b5c866fc91a78be562d3f1363210df Cab Guid: 0 WER.f4147c4f-eeb0-4620-a50a-da8b248e2de1.tmp.WERInternalMetadata: <WERReportMetadata> <OSVersionInformation> <WindowsNTVersion>10.0</WindowsNTVersion> <Build>26200</Build> <Product>(0x30): Windows 10 Pro</Product> <Edition>Professional</Edition> <BuildString>26100.7623.amd64fre.ge_release.240331-1435</BuildString> <Revision>7623</Revision> <Flavor>Multiprocessor Free</Flavor> <Architecture>X64</Architecture> <LCID>1033</LCID> <BuildLayers> <BuildLayer LayerName="26100.1.amd64fre.ge_release.240331-1435" OsMajorVersion="10" OsMinorVersion="0" BuildNumber="26200" QfeNumber="7623" IsTopLevel="1" IsChecked="0" BuildStamp="240331-1435" BuildBranch="ge_release" BuildArch="amd64" BuildLab="26100.ge_release.240331-1435" BuildLabEx="26100.1.amd64fre.ge_release.240331-1435"/> <BuildLayer LayerName="26100.1.amd64fre.ge_release.240331-1435" OsMajorVersion="10" OsMinorVersion="0" BuildNumber="26200" QfeNumber="7623" IsTopLevel="0" IsChecked="0" BuildStamp="240331-1435" BuildBranch="ge_release" BuildArch="amd64" BuildLab="26100.ge_release.240331-1435" BuildLabEx="26100.1.amd64fre.ge_release.240331-1435"/> <BuildLayer LayerName="26100.7623.amd64fre.ge_release_svc_prod1.260108-1011" OsMajorVersion="10" OsMinorVersion="0" BuildNumber="26100" QfeNumber="7623" IsTopLevel="0" IsChecked="0" BuildStamp="260108-1011" BuildBranch="ge_release_svc_prod1" BuildArch="amd64" BuildLab="26100.ge_release_svc_prod1.260108-1011" BuildLabEx="26100.7623.amd64fre.ge_release_svc_prod1.260108-1011"/> <BuildLayer LayerName="26100.7623.amd64fre.ge_release_svc_prod1.260108-1011" OsMajorVersion="10" OsMinorVersion="0" BuildNumber="26100" QfeNumber="7623" IsTopLevel="0" IsChecked="0" BuildStamp="260108-1011" BuildBranch="ge_release_svc_prod1" BuildArch="amd64" BuildLab="26100.ge_release_svc_prod1.260108-1011" BuildLabEx="26100.7623.amd64fre.ge_release_svc_prod1.260108-1011"/> </BuildLayers> </OSVersionInformation> <ProblemSignatures> <EventType>AppHangB1</EventType> <Parameter0>firefox.exe</Parameter0> <Parameter1>147.0.1.271</Parameter1> <Parameter2>696a121b</Parameter2> <Parameter3>79cd</Parameter3> <Parameter4>67246080</Parameter4> </ProblemSignatures> <DynamicSignatures> <Parameter1>10.0.26200.2.0.0.256.48</Parameter1> <Parameter2>1033</Parameter2> <Parameter22>79cdc92835a52d4d6fe18eaad0b4697c</Parameter22> <Parameter23>ee57</Parameter23> <Parameter24>ee5795050602fee0b60b85074fca3a49</Parameter24> <Parameter25>79cd</Parameter25> <Parameter26>79cdc92835a52d4d6fe18eaad0b4697c</Parameter26> <Parameter27>ee57</Parameter27> <Parameter28>ee5795050602fee0b60b85074fca3a49</Parameter28> </DynamicSignatures> <SystemInformation> <MID>537F40F1-EDA1-4A66-8FAF-BC926D27E2F5</MID> <SystemManufacturer>Dell Inc.</SystemManufacturer> <SystemProductName>Latitude 5530</SystemProductName> <BIOSVersion>1.32.1</BIOSVersion> <OSInstallDate>1752501831</OSInstallDate> <OSInstallTime>2025-07-14T14:03:43Z</OSInstallTime> <TimeZoneBias>05:00</TimeZoneBias> </SystemInformation> <SecureBootState> <UEFISecureBootEnabled>1</UEFISecureBootEnabled> <PolicyPublisher>{77fa9abd-0359-4d32-bd60-28f4e78f784b}</PolicyPublisher> </SecureBootState> <ReportInformation> <Guid>0483653f-e57b-460c-be7b-d7958bac7471</Guid> <CreationTime>2026-01-16T19:20:43Z</CreationTime> </ReportInformation> </WERReportMetadata>