Firefox on Windows 11 Pro 25H2 freezes after windows update including KB5074109

Environment: Windows 11 Pro, Version 25H2, Updated windows (include KB5074109) on Jan 16, 2026. Firefox version 107.0 Issue: Firefox freeze shortly (e.g. afte… (ვრცლად)

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>

კითხვის დამსმელი Handong Wang 2 დღის წინ

Private tabs auto close too soon

Up until recent versions, I had the option to choose after what duration of inactivity, all open private tabs would close automatically. After the recent update, I can't … (ვრცლად)

Up until recent versions, I had the option to choose after what duration of inactivity, all open private tabs would close automatically. After the recent update, I can't locate this setting. Moreover, the duration is now not just non customizable, but also random. Sometimes, Firefox closes them in a couple of minutes, sometimes 20, and after more than an hour at other times.

კითხვის დამსმელი Ankur 2 დღის წინ

Filters inThunderbird

Some senders for example Tangle go straight to my trash and if I move them to the inbox it immediately moves it back to trash. I do not understand what is blocking this … (ვრცლად)

Some senders for example Tangle go straight to my trash and if I move them to the inbox it immediately moves it back to trash. I do not understand what is blocking this nor how to do anything about it. Some send such as Erick Erickson generally go to inbox, but not always. Sometimes it goes to trash again.

Same Topic slightly different question... when I tell Thunderbird to delete all messages older than one year it does not do it. I do not know how to solve this problem. I do contribute to Thunderbird and thank you very much for any help that you can give. Don

კითხვის დამსმელი bedell.dandd 2 დღის წინ

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Unable to bring up a contact when trying to compose an email.

I have discovered Major problem with Firefox which affects the use of my btinternet.com email account . Since the recent update I am no longer able to add the contact n… (ვრცლად)

I have discovered Major problem with Firefox which affects the use of my btinternet.com email account . Since the recent update I am no longer able to add the contact name to a new email which I wish to compose automatically from my contacts (I am required to type it in full. I can still do it, with the shortcut of typing in the first 3 letters, when using other browsers such as Google or Edge or the Outlook muti mail account service but generally prefer Firefox. If this situation prevails I will ditch Firefox as speed of communication and addressing is of the essence to me. Are Firefox aware and are they correcting things?

Could any settings have been altered by the update - which contribute to my problem?

კითხვის დამსმელი briansnowden 2 დღის წინ

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Twitch Chat keeps disconnecting/reconnecting exclusively on Firefox

I have a very repeatable issue, that others have been dealing with as well, where Firefox will frequently disconnect Twitch chat after a period of time and go through a l… (ვრცლად)

I have a very repeatable issue, that others have been dealing with as well, where Firefox will frequently disconnect Twitch chat after a period of time and go through a loop of disconnecting/reconnecting.

This is ONLY on Firefox, I can run Chrome or other browsers simultaneously with Firefox and Firefox will disconnect when others do not.

I am not sure what is occurring, but I know it only happens after a while. Like maybe after 30+ minutes of watching a stream, the chat will start skipping other users inputs, just show my own, then give me a Welcome to the chat connection and other messages will start appearing again. Once it hits this hang-up period, it starts disconnecting frequently.

I cannot find any resolution and there are no resources or articles about this, but I made a post on reddit and multiple users reported the same thing.

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Bookmarks

Good morning Last night I transferred all my data from Samsung S20+ to Sansung25. Everything works great except my bookmarks didn't transfer?

კითხვის დამსმელი Bosnawi74 2 დღის წინ

All my bookmarks/history/passwords are gone

Afternoon, I've used this account for a long time and today I had to reset my PC. I was always signed into to Firefox to manage my bookmarks/passwords/history, however … (ვრცლად)

Afternoon,

I've used this account for a long time and today I had to reset my PC.

I was always signed into to Firefox to manage my bookmarks/passwords/history, however I've signed in now and everything is gone.

It won't sync up. I've tried removing the profile folders, copying them out, uninstalling/reinstalling firefox but nothing is working.

I tried to disable Windows defender, but that didn't do anything either.

The version I had at the time was Mozilla Firefox (x64 en-GB) Mozilla 147.0 which is the same version.

Is there anything that can be looked at, to see what has happened to the data I has?

კითხვის დამსმელი jamie.gubb 2 დღის წინ

Cookies

I have had Google today almost lock me out of my account there thru various email accounts I have with them because they were not recognizing my devices that I always use… (ვრცლად)

I have had Google today almost lock me out of my account there thru various email accounts I have with them because they were not recognizing my devices that I always use daily and have for months and even years because of cookies that I don't delete and because I was not on the same browsers or accounts each time which I was unaware that I had or should stay on the same. So could I through you find out how to delete cookies that I have/had accepted in the past?

კითხვის დამსმელი Cary's FIREFOX Account 2 დღის წინ

Firefox 142.0.1 (aarch64) sync prompt is wrong and risks wiping wrong device with data

Desktop browser: no Bookmarks Phone browser: Bookmarks Goal: Sync phone browser Bookmarks to desktop browser Bookmarks. Danger: backup Bookmarks before Sync syncs wrong w… (ვრცლად)

Desktop browser: no Bookmarks Phone browser: Bookmarks Goal: Sync phone browser Bookmarks to desktop browser Bookmarks. Danger: backup Bookmarks before Sync syncs wrong way and no data wipes data device.

Desktop browser sync prompt is wrong: Menu -> tap Sync and save data -> tap Ready to Scan -> scan desktop Firefox QR code -> Pairing unsuccessful. Try again. OK

Here's the correct steps: Sync your Firefox experience -> tap I already have Firefox for mobile -> tap Continue -> Sync Firefox on your phone or tablet -> open Firefox 144.1 (62735) on phone -> tap Menu (3 dots at bottom) -> tap Settings -> tap Sync Now -> desktop Firefox -> open new Tab -> Bookmarks appear -> right click Import bookmarks from another browser to Firefox -> tap Remove from Toolbar.

See also: https://support.mozilla.org/en-US/questions/1552007

კითხვის დამსმელი kFirefoxForum 1 თვის წინ

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How to backup iOS Firefox bookmarks before a sync wipes from an empty device2?

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BT Email groups won't load

Hi, Recently and despite upating to the latest Firefox Browser, when I try to use BT Email groups it offers it as I type and I select. It then just shows the first charac… (ვრცლად)

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Deleting Firefox history

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Windows 10 Firefox 147

Wilbur Young wilyoung@olypen.com

კითხვის დამსმელი Wil 2 დღის წინ

FireFox

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A week ago, I created a new google calendar and added it to thunderbird/lightning using the built-in google calendar support. Now, when I accept a calendar invitation, it automatically goes to the new calendar (which is generally not appropriate) without asking me to choose. Furthermore, I am unable to edit these calendar events to change the calendar they are associated with. I have checked the properties of both the new and old calendars and they look the same.

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Respectfully, Don

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