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So for three days now, my firefox constantly crashes. I would be reading a story online or watching a video on Youtube and then it will suddenly freeze. In videos, it'll still play the sound but the screen will freeze. I can't pause or stop it. Then either Firefox crashes and closes or I have to close it for it to stop. Sometimes, when I try opening it again, it still won't open. I used to have 50 tabs open and never ad this issue. After this, I closed all the open tabs, even deactivated a bunch of extensions, run malware detection, and still the issue continues. I don't know what the problem is. I even followed instructions and deactivated hardware acceleration options in Performance. And I have all AI options turned off too. The app also recently was updated.

crash report bp-e455fd8b-e30b-4cdc-811a-346ac0260607

I cannot use Firefox without it blowing up my memory to 86GB used in Activity Monitor. I've cleared my cache, closed all my tabs and bookmarked them. I have a Macbook Air M1 2020. I've tried restarting and am definitely using the current version of Firefox. I also updated to the latest OS Tahoe 26.5 to see if that helped. What should I do next please?!

I have been using Thunderbird for years with no problems. However recently, Thunderbird very often simply stops responding. Sometimes it just hangs up and sometimes the program bar at the top displays "Mozilla Thunderbird (Not Responding)". If I try to wait for it to respond, it literally hangs for several minutes before it begins to respond again, and often, it simply never starts responding again. It has simply gotten to the point where Thunderbird is practically unusable. All my other application software continues to work with no problems. It's just Thumderbird.

The version number in this submission may not be correct. I can't provide the real version number because of the hangups.

Any suggestions?

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?