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I had this trouble after Firefox's previous update, where the browser would just close as I was in a tab. It had stopped so I thought the problem was fixed. However, it just updated the browser a few days ago and again I'm having a problem where the browser will just close in the middle of me entering information. It does not have to do with which program I am in as it just seems to happen randomly. It does not save any information I've typed in.

Thunderbird keeps locking up. I have twice uninstalled and reinstalled, yet Thunderbird still locks up with the processing message. At this point, I want to know if 1) there is an online interface that I can try, and 2) If my emails can be salvaged somehow.

I tried the troubleshooting tips on the web, but I can't even get into the folders, even in troubleshooting mode.

Good morning

Since this morning (05/03/2026) Thunderbird freezes within a minute or two of opening the program.

Everything in the program freezes up. I cannot even close it.

I am running Version 140.8.0esr on a Windows 10 PC.

Initially I was getting a pop up warning message that ask me to confirm if I wanted to send an email with attachments of over 20 MB. There were 3 or 4 such messages. I had not tried to send such emails.

I checked the Outbox in Local folders for old messages, but it was empty. I also checked the Unsent messages files in Local Folders in the Profile folder. I deleted the Unsent Messages.msf file to no effect. I renamed and replaced the Unsent messages file. Also no change.

I checked for crash logs but there are none.

I have run out of ideas as to what to try next. Does anyone have any advice?

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.

Since the latest Firefox update, it has frozen the app & crashed my computer multiple times within a few days; it has also caused problems logging into my primary bank account ("access denied") but has nothing to do with the bank (I called the bank; no problems there, but they suggest using Chrome browser. NO WAY!) Every time Firefox has updated the past few months, it has interfered with my password vault’s proper functioning {Last Pass}. I am using a late 2012 Mac mini, running OS 10.15.1 (the newest acceptable OS for my computer). I attribute some of the problem to their adding a number of new features without making certain the basic app is stable.

Responses should be addressed to [edited email from community support forum]

Running windows 11 Pro and in the last microsoft update my thunderbird email is not responding at all. It is trying to connect to imap.gmail.com.

How can i turn off auto account checking on startup so i can access my email settings to try and fix this?

I tried running it in safe mode and i get not responding there too! Can i access a profile folder and turn off auto email checking somehow?

Firefox mobile browser app (Samsung Galaxy S21 Ultra, OneUI 7, Android 15) crashes after a few minutes even though account was logged out, and cache and mobile data cleared before app was uninstalled, and reinstalled with re-logged account.

This is my default mobile browser since I had my mobile phone. The app started crashing the first time that I logged out my firefox account, and the problem remains.

In past 2 days I've experienced Firefox randomly closing all open firefox windows and then bringing them back after a brief delay. There is no mention of an update or other reason while this would occur.

My thunderbird download program on my apple Mac won't open. When I click on the app the page opens but I can't access it as there is just a spinning coloured ball. This has been happening off and on for the last month but now for the past 3 days it is constant. I can't open the thunderbird help option

Whilst using TB the screen went white with dozens of little tabs along the top of the screeen with what look like page icons, as the app became 'not responding'. Re-loading didn't help - same screen. Re-starting didn't help. I uninstalled and re-installed TB but it is stil the same. Opening in Windows (11) safe mode produced virtually the same result except for a few seconds I was able to open the hamburger menu and select trouble shooting. Opened in trouble shooting mode showed several alerts of 'failed to connect with servers' (outlook.office365.com imap.gmail.com and Yahoo). Then it shut down as before 'not responding'. When open, TB is using some 80% of available memory., and I can only close it by using Task Manager. I'm a complete dunce at this stuff so, if anyone knows a way out of this hole, please use simple English! Thanks, Jeff

As of a few days ago, when I open Thunderbird, various unprecedented and unpleasant things happen. Sometimes I immediately get a message that my account is "processing," and that I need to wait a while before accessing messages. More annoyingly, though, often when I do start downloading new messages, it downloads a few but then freezes. (I can see how many there are, e.g. "Downloading 5 of 48 messages," but then it freezes at 5.). After another minute or so (not sure about the exact timing), Thunderbird goes into "not responding" mode, and my only option is to close the program; rinse and repeat. Sometimes I will get this message: "Unable to write the email to the mailbox. Make sure the file system allows you write privileges, and you have enough disk space to copy the mail." (Let me interject with this: I have already looked in the Mozilla Support system and have found a discussion of this problem, but the solutions proposed fall into two categories: (1) things I understand, and have tried (e.g. creating an exception for Thunderbird in my AV program), but that haven't worked; and (2) things I do NOT understand and am therefore nervous about pursuing (e.g. "make sure the files system allows you write privileges" -- I don't even know what that MEANS, let alone how to fix it). I have thought, based on a few things I've read, that creating a new profile might help, but this leads me into uncharted territory, and makes me nervous. So, a plea to whoever might respond here: I am NOT a sophisticated computer user, so whatever advice you give me, feel free to dumb it down as much as possible. (I will not be insulted if you address me as though I'm an idiot; in this realm, I am.) Thanks in advance for any and all help.

Whenever I try to click the upload button it freezes, it doesn’t even open Finder it just gives me the spinning wheel and then I have to force quit. But strangely if it gives me the option to drag the file it works fine.

I'm on Big Sur 11.7.11 if that helps. I saw a very similar post but it was posted in 2018 by pinwhale.

My Thunderbird client install on a particular PC had a crash yesterday afternoon, and it appears that I have lost my folder structure and sent folder for one of the 5 email accounts that is set up in this client. The rest of the accounts in this client setup are fine. The account that experienced the crash was set up as a POP3 account, so I cannot just reload from the server. Unfortunately I did not back this thunderbird profile up recently enough. Is there anyway to recover what was lost? Is it hiding somewhere on the PC? ANy options to try?

Been getting thes3 crash reports on Firefox for Android:

a5c056d7-ba17-4116-a33f-e84676d85daa java.lang.OutOfMemoryError: Failed to allocate a 134217744 byte allocation with 50331648 free bytes and 120MB until OOM, target footprint 125473072, growth limit 201326592

java.lang.OutOfMemoryError: Failed to allocate a 134217744 byte allocation with 50331648 free bytes and 120MB until OOM, target footprint 125473072, growth limit 201326592 at java.util.Arrays.copyOf(Arrays.java:3785) at java.io.ByteArrayOutputStream.grow(ByteArrayOutputStream.java:120) at java.io.ByteArrayOutputStream.ensureCapacity(ByteArrayOutputStream.java:95) at java.io.ByteArrayOutputStream.write(ByteArrayOutputStream.java:156) at kotlin.io.ByteStreamsKt.copyTo(IOStreams.kt:19) at kotlin.io.ByteStreamsKt.readBytes(IOStreams.kt:21) at mozilla.appservices.httpconfig.FetchBackend.sendRequest$lambda$3(FetchBackend.kt:6) at mozilla.appservices.httpconfig.FetchBackend.sendRequest(FetchBackend.kt:273) at mozilla.appservices.viaduct.uniffiCallbackInterfaceBackend$sendRequest$callback$$inlined$uniffiAsyncCallback$1.invokeSuspend(viaduct.kt:101) at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:9) at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:122) at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:127) Suppressed: kotlinx.coroutines.internal.DiagnosticCoroutineContextException: [StandaloneCoroutine{Cancelling}@3443bed, Dispatchers.Default]

Any ideas as to what I should do?

Suddenly Thunderbird takes a long time to download even a few (10-20) emails from Gmail and then it freezes on an email and as I click on different emails only the original one shows on the bottom half of the screen, even if I change to a different folder/email account. Also it will not close when I hit the X in the upper right corner.

If I click on one of the other apps, such as Calendar it goes to calendar but when I go back to email it still shows that same frozen email.

I tried clicking on the three bars (hamburger) to find the Thunderbird version and nothing happens.

I have restarted the computer but that has not helped.

This is an add on to the previous portion that I wrote yesterday. Today nothing shows in the portion where I usually view the message after I've clicked on it. Also the options in the tool bar such as File, Edit, View etc. do not respond to a click after the first time I have attempted to look at a message.

I am considering uninstalling and reinstalling. If I do that will it find all my emails and folders etc. again? There are a few emails that I am quite desperate to access that I have put in folders.

I'd really appreciate any help I can get on this as some important work is being delayed until I can access those emails.

Thanks for any assistance!