Forum der Gemeinschaft Firefox

Tabs will crash over and over again. I can barely look at any given page for longer than a minute or two. What happened?? Firefox was never like this before. It just crashed in the middle of me typing this LMAO. Using Brave in the meantime. This is ridiculous.

All the tabs, in both my profiles are constantly crashing. I cannot keep at a task for more than a few minutes without needing to restart the tab. Is this a setting problem? I've cleared the cache, and reset Firefox, to no avail. Thank you for any relevant advice and/or assistance.

Firefox is CONSTANTLY crashing now and I'm about ready to switch to another browser unless someone can give me a reason to stay.

Moderator note: This question has been edited to clarify OS version (based on crash reports).

I am running Firefox 151.0.4 on a Win 11 (25H2) AMD Ryzen 5, 32 GB ram. Every time I close Firefox, it generates a crash report. That takes several minutes during which I can't start a new Firefox window. The crash report says the report was submitted successfully but when I look in about:crashes the reports shows they need to be submitted.

I ran in troubleshoot mode and disabled all plugins and did not see any extensions listed. I restarted and it still crashes. Firefox seems to run fine. But the crashes when it closes are annoying and disruptive.

here are the first few lines of a recent crash report: Firefox 147.0.1 Crash Report [@ shutdownhang | mozilla::SpinEventLoopUntil | nsThreadPool::ShutdownWithTimeout ]

   Search Mozilla Support for this signature How to read this crash report 

You are seeing public data only. See protected data access documentation for more information. Crash ID: c921c76e-8902-414d-aad6-1d4d50260611 Signature: [@ shutdownhang | mozilla::SpinEventLoopUntil | nsThreadPool::ShutdownWithTimeout ]

Hello everyone,

yesterday I got quite a scare. While Firefox was open, a new tab briefly appeared showing the page about:processes, and immediately afterwards the browser closed itself on its own.

At the same time, Chrome was open in the background. When I clicked on Chrome, a prompt appeared asking whether I wanted to allow changes to be made to the system (the typical UAC prompt). However, I’m not entirely sure if this was actually triggered by Chrome or possibly by another application.

I clicked “No” on the UAC prompt and immediately unplugged my keyboard. I recently started using an ASUS ROG Falcata, which is connected via USB.

After that, I ran a virus scan with Windows Defender — it didn’t find anything. I also ran AdwCleaner, which also came up clean.

At first, I suspected the ASUS ROG Falcata (I’ve only been using it for a few days), since it’s almost like a small computer itself and can execute macros, patterns, etc. I was worried about a possible firmware bug or something worse. At the moment, I’m honestly hesitant to plug it back in and am using an old Dell keyboard instead.

Importantly, I wasn’t pressing any keys at the time of the incident.

Now I’m quite unsure what could have caused this.

Is there any way to trace this in Firefox (e.g., via logs)?

And is there any (event) log where I could check what triggered the UAC prompt?

One more thing I noticed: I shut down the PC afterward and turned it back on later that evening. Everything booted normally and is still running fine today. However, Firefox updated itself yesterday from version 148.2 to 149. Maybe that was somehow related (though there’s no indication in the Firefox update history that anything failed or similar).

I've been using Mozilla Firefox browser for the better part of the last two decades, having always found it to be the most functional and useful over all competitors, who generally seem more interested in raising revenue or spewing puerile and slanted politics. I've been accustomed to the occasional "crashes" and always provided input when they occurred, convinced that the interruptions would be brief and with any issues resolved. Today was different.

Lately, my processor was experiencing some "aging" issues: slowdowns, freezing forcing me to re-start, and random re-starts on its own. Over the weekend I conducted a comprehensive series of diagnostic tests of all features of the operating system. To my relief, the system went back to normal and efficient, including the browser -- for about 2 days.

Early today the browser became slow, eventually inactive, and ultimately crashing 7 times. But all these time were different: my input into the "crash warning box" was not permitted and closing the box only resulted with the next crash. All crashes had the same reason posted on their reports: "Crash Reason EXCEPTION_ACCESS_VIOLATION."

When the crashes finally ended, my browser looked totally unlike it did before:

(1) ALL of the shortcuts I entered on the home page and relied upon for years VANISHED. (2) ALL of the browser windows and the open tabs I was working through at the time EVAPORATED. (3) ALL extensions I saved and used routinely GONE.

By the end of the day, one spent trying to resurrect "my" Mozilla browser with minimal damage, something else disconcerting occurred: the processor's operating system randomly shut and re-started. I don't want to point fingers just yet and allege this was connected with my browser failing, but the coincidence is troubling, one I would recommend looking into. My assistance is, of course, automatic.

--Thanks, Steve Saucedo

Firefox keeps suddenly crashing, I have reset Firefox, deleted it and reinstalled it, I have used DISM and SFC to repair any issues and I have set up a new profile within Firefox with no extensions, but still I have the same issue, either tabs suddenly crash or the whole Firefox does.

Hello, Whenever I open Firefox, it crashes repeatedly. This has been going on for at least a couple of weeks, whether it's right when I open it or hours later when I'm in the middle of something. I've disabled extensions, ran it in troubleshoot, and done the steps advised to no avail. Any help would be greatly appreciated as this has rendered Firefox unusable. Attached is a screenshot of the digits of the crash reports, as well as the link for the one from today.

Hello,

Ever since latest update (153.0 (64 bits) everything crash. I can open Firefox, but as soon as I enter a website, regardless of what it is, it won't load.

If i try to close the app, there's always a process that keeps running. It can't close. And if I try to force it it says that access is refused.

After that I keep receiving these errors that Firefox is already open and I need to close the last process of Firefox to continue but even if I say to close, it keeps repeating until my PC finally crash.

Everything was working 100% until Firefox updated itself. No Windows update nothing.

I can't even send crash report since it does the same error.

My browser started crashing after the latest update, and it still crashes even in Safe Mode. It doesn’t close immediately upon opening; instead, it shuts down suddenly after about one minute or longer. This issue never occurred before and only started appearing after the recent update. My system is Windows 11, with the following detailed information: Edition: Windows 11 Pro Version: 23H2 Install date: September 17, 2023 OS build: 22631.5624 Experience: Windows Feature Experience Pack 1000.22700.1106.0

I've got constant crashes jn last update Firefox 148.0.2 (Desktop). Often it happens when Google Meets launched in browser and i started switch between tabs or another applications. In Widows logs i found this error: Имя сбойного приложения: firefox.exe, версия: 0.0.0.0, метка времени: 0x00000000 Имя сбойного модуля: unknown, версия: 0.0.0.0, метка времени: 0x00000000 Код исключения: 0xc00000fd Смещение ошибки: 0x00007ffce9d07286 Идентификатор сбойного процесса: 0x0x3F64 Время запуска сбойного приложения: 0x0x1DCB6A7BAE6121F Путь сбойного приложения: C:\Program Files\Mozilla Firefox\firefox.exe Путь сбойного модуля: unknown Идентификатор отчета: 1a851f87-1b94-4270-8d86-a6850200a62b Полное имя сбойного пакета: Код приложения, связанного со сбойным пакетом:

Installed system Windows 11

Hi my firefox just updated to version 153.0.1 on all 5 family computers some running win 11 and some win 10 and 2 win 11 pro. now we all experience firefox crashing and not loading pages. When we go to settings and select contact support it says the system crashed. Is there a way to roll back to a version that works without crashing without have to revert to goggle chrome or edge? regards Mal

- However I think it may be to do with a recent bookmark entry stored in the bookmarks bar?? The website is a national UK hardware store and it seems to open OK. I cannot be sure but I think the problem started after I added this bookmark. It is a real nuisance and I have had to switch to Edge. Please advise how I might fix the problem.

bookmark https://www.radiatoroutlet.co.uk/?gad_source=1&gad_campaignid=1488717521&gclid=EAIaIQobChMIlO36_NLelQMVopdQBh0cygqfEAAYASAAEgL9EPD_BwE

URL at time of crash. https://mail.yahoo.com/d/folders/1

Can get very little done in my eMail for www.att.net. Yahoo.com does also crash occasionally.

I've tried reloading my software for ATT.net, Norton.com, Dell.com and others as I went. Reload went okay, Tried several reboots. Still no luck.

Just got my repaired laptop back. Windows Home 23H2 build 22631.6199. Installed Firefox, synched my account. Firefox or a firefox tab have crashed 19 times in the last 3 days since the fresh install.

5 most recent submitted

Report ID Date Submitted bp-d5cc4d87-e2dd-4149-93ec-d91000260401 4/1/2026, 10:39 AM View bp-09b6f228-0b9e-4827-85e7-108df0260401 3/31/2026, 7:43 PM View bp-2edc9f85-37b3-4a37-8a1b-ed6390260331 3/31/2026, 11:03 AM View bp-df98c40c-38d4-4d41-ad0a-104430260331 3/31/2026, 10:59 AM View bp-5a3b7f96-699e-4096-98c4-411ab0260402 4/2/2026, 9:51 AM

Actually crashed while preparing this message. What to do?

Hello,

I would like to report a potential bug in Mozilla Firefox related to recent updates.

After downloading a PDF file and opening it directly in the browser, the tab crashes. Following this crash, it becomes impossible to open any files (regardless of file type) within the browser — every attempt results in another tab crash. The crash report cannot be reviewed, as the tab fails immediately and can only be closed.

As a temporary workaround, changing the default PDF handler to an external application prevents the issue. However, this is not a viable solution for us, since some of our internal systems require PDFs to open directly in the browser after download.

We have verified that this issue does NOT occur in version 148.0.2 — everything works correctly there. However, after updating to version 149.0, the problem reappears consistently. Firefox also automatically updates after synchronization, making it difficult to remain on a stable version.

According to the release notes, there were changes in PDF handling in recent updates, so this may be related to a technical regression.

Could you please investigate this issue or advise on a proper fix or workaround?

Best regards, Daniel Mazur VanityStyle IT Specialist