Firefox Community Forum

Firefox 146.0.1 (aarch64) macOS 26.2 (25C56) on M2 Pro

Hello.

I'm dealing with a strange issue that began with Firefox 146.0 and continues with 146.0.1. I previously blocked categories I do not care about such as Parenting, Cooking, and others. When doing so, for some reason some of my followed topics including Sports, NFL and NHL no longer appear along with the rest of the topics I've followed. (Please notice only followed sports-related topics disappeared...)

Checking the settings for Firefox Home shows no blocked topics (even those I have explicitly blocked), and checking what I can think to think via about:config shows me nothing I can edit to get my desired topics back.

So, I'm not sure what to edit to get my missing topics back. If they were blocked because of some bug, i cannot see blocked topics in the Firefox Home settings, so I cannot unblock them if that's what would need to be done. Has anyone else experienced this? If so, were you able to resolve it or are you aware of some BugZilla or GitHub issue I can watch for this one?

Any help will be certainly be appreciated. Thank you in advance.

So I guess my Firefox update to ver. 147 from 146 by its auto update feature, but I realized all the past personal data (ie, history, cookies, passwords, profile, etc) was gone.

I have Mozilla Account (I think it's the same as Firefox Account back in the old days), so my personal data is now retrieved from some device as far as possible, but I lost local personal settings like Shortcuts on the main page on my laptop,p which is the main device to do everything.

I can't help what happened to me, and I will rebuild what I used to be on that day, but I am curious if it's just me, or there is some logic to cause this data loss.

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>

418 Hello, I like your site (and I donate a little from time to time), but some of Firefox's behavior is becoming annoying: for months now, Le Monde articles have been cut off on the right (not those from Le Figaro), and recently Instagram has been blocking the browser after a few posts. Of course, it might be "their fault," but it's clear that it doesn't happen like that with Chrome. Good luck!

I can delete history entries in a date range from today, 1/16/26, back to 1/10/26, but not 1/09/26 or before. Is it intended that earlier history is to be not deletable?

Windows 10 Firefox 147

Wilbur Young wilyoung@olypen.com

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 character of the group or email surrounded by a red box and a x next to it and doesn't expand into the members of the group. This automatically suplied email recipient address is invalid. I've tried clearing the cache for the webpage to no avail. The problem doesn't occur in the Chrome browser. Kind regards Michael

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?

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?

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.

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?

Hello all, I have two HP computers running Win10 home on the ESU program and will be buying new computers in several months with Win11 factory installed. One is an Omen desktop and the other is a Envy laptop. I noticed in my Event Viewer after updating Firefox to 147 that I am now getting three consecutive 10016 DCOM Warnings every time I open Firefox. This has never happened before in all the years I have used Firefox. Now I completely understand that we should just ignore 10016 DCOM https://learn.microsoft.com/en-us/troubleshoot/windows-client/application-management/event-10016-logged-when-accessing-dcom but I find it strange that all of a sudden it is now happening and only for Firefox and on both computers. I do have the procedure to fix DCOM errors but do not like messing with the registry and permissions even though I have in the past with no problems but there is always that chance that it could and I do not want to risk it. I was wondering if any other users are seeing this in their Event Viewer System Log for Firefox or is this a known or unknown Firefox update problem or what.

Respectfully, Don

Every video i watch is not centered on my screen i tried everything thinking it was on my end but if i try it on chrome and edge everything is fine. Note that only the left and upper side has a space when in full screen the right and bottom are ok In the second image it's on youtube and may appear a bit more clearer

When I try to change the wallpaper in WhatsApp, Firefox freezes completely. I have Windows 11 Home 25H2 on a Dell Ultra 9 PC with 64GB RAM.

I've taken these measures without success:

1. Logged out of WhatsApp.
2. Deleted cookies & browser cache.
3. Logged into WhatsApp.
4. Tried Troubleshoot mode.

This issue doesn't happen in Chrome or Edge. WhatsApp Support had no further advice to give.

Kind regards Gummo

Background is a little complex. We have been running Win 10 under the ESU, My wife had her box unintentionally do a Win 11 update. She then started a backup which then looked like it would take days, so she aborted it after a while and ran the procedure to revert to Win 10, which then completed successfully. I think she then rebooted and opened Firefox and all her prior windows were there and working, After a while they got slower and slower, so she closed Firefox, might have rebooted and restarted Firefox. She now has 37 windows that are all completely blank. There is a New Tab tab and now URL in any window,

Is there any way that would likely recover all those open windows? Or, at least the URLs of all the tabs?