Firefox Community Forum

Hi,

I use FF 146.0.1 64-bit on MacOs Sonoma.

I experience this weird FF behaviour. I usually keep FF open all the time. After a while, days, maybe weeks, some UI elements start flashing when I hover the mouse above them. As an example, I use the whatsapp web UI. When this happens, I cannot click anymore on the emoji icon (on the right side of the message) to add an emoji icon to a message because that icon is flashing like crazy when I hover the mouse above it, and when I click the mouse I cannot hit it. Refreshing the page doesn't fix it. What I usually do is I restart the browser and then it gets its brains back.

I am just curious if any of you experienced this. It starts to become annoying.

Thanks

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>

When I first open Firefox I have noticed the past few days that if I try to click on anything on the menu bar right away I get a not responding error message and I have to end up shutting the program down. If I wait a few minutes the menu bar does work normally.

I am having trouble downloading documents. They never finish loading and if they do I cannot download them to a file. Also when I exit firefox it isn't closing correctly. It brings up the last session. It keeps telling me it is still running even though I am exiting.

I have 5 windows open in Firefox, yet only 1 of them is visible/accessible on the Windows Taskbar.

I know there are 5 windows open as Troubleshooting Information reports "Multiprocess Windows: 5/5"

Sometimes when I launch Firefox, the other 4 windows will be visible, and this current one will disappear. If I go to Recently Closed Windows and open that window, it will appear, but the other 4 will be hidden again.

Other times, I will launch Firefox and one window will be invisible, and it won't appear unless I close all the other windows, then it will suddenly appear out of nowhere.

I've disabled extensions, changed settings, and reinstalled multiple times, but Firefox won't quit stuttering constantly. Other browsers work fine on my computer, and Firefox doesn't seem to be using much memory.