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I am running Fedora 42 KDE spin ("plasma"). The "Discover Software Center" app offers Thunderbird as both a regular and a flatpak install, and I somewhat arbitrarily chose flatpak.

I am dealing with several legacy email accounts that have 20 years of messages, so I need to control where the profile was created, so immediately after installing I ran with -P to create a profile and specified a path name of /lore/jeff/thunderbird. /lore is the mountpoint of /dev/sda2 and it is in my /etc/fstab. /lore/jeff previously existed because that's where I put my Dropbox folder.

Every time I shut down TB and restart it later it always fails because lock and .parentlock are never deleted. Until now, I just dealt with it by deleting the files in bash, but today I wanted to make sure that TB always starts offline and decided that user.js would be the absolute safest way to guarantee that, so I pulled up profiles.ini to get a list of all profile paths to make sure that I put a copy of user.js in each and every one whether it's in use or not. What I discovered is that the profile I created does NOT have a Path of /lore/jeff/thunderbird but instead /run/user/1000/doc/e1a4ab74/thunderbird and not only that but at the very bottom of the file are these three lines [InstallBD520B11F73A6B64] Default=/run/user/1000/doc/e1a4ab74/thunderbird Locked=1

The interesting thing is that when I put user.js into the /run/user... path and then looked at /lore/jeff/thunderbird to check on lock and .parentlock, I see that there is magically a copy of user.js there. I'm not exactly sure what is going on because when I do `ls -ldi` on the two files, their inode numbers are vastly different. I don't know enough about how flatpak operates internally, but my gut tells me it has something to do with it, and my question that I'm finally getting around to asking is if I edit the profiles.ini file to use /lore/jeff/thunderbird in an attempt to get TB to correctly clean up the lock files, is that going to cause a problem because of whatever flatpak is doing? And should I complain to flatpak about it?

Thanks for reading :-)

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

my firefox keep crashing when i join google meet and i need to do multitask so i open another firefox windows(private or not) it always crash few second after, i have tried the trouble shoot mode its still crashing, even the new windows from SSO request do trigger my firefox to crash. when the browser crash it does offer me to restore my session

Hi, The versions of Firefox since Feb 2026 have been extremely memory hungry on Windows 10, even though I have the option to restore tabs on demand set to TRUE in the config.

The memory hungriness has got so bad now that even on my 16GB machine, about once a week I find that my computer has suddenly run out of memory without warning and my entire screen goes black (not just within the Firefox window, the entire screen). When the computer gets into that state I am unable to use Ctrl+Alt+Del to get back to Task Manager, and the only way out is to hard-reset my computer.

This means that whenever I want to do anything else remotely memory hungry, such as running my research code, or a game, or a Zoom meeting, I have to kill Firefox first. But I sometimes even end up with black screen when trying to use Word or Excel alongside Firefox.

Essentially, Firefox is becoming unusable on my desktop, and its bookmark feature is borderline unusable on mobile now since the update a month ago made it impossible to change which folder I save my new mobile bookmarks in.

So if I have two more black screen clashes I think I will give up using Firefox entirely after being loyal to it for about 15 years. This is extremely disappointing.

Louise

I sometimes find that after I have filled in the email address and subject of the email and sometimes start writing the email, it goes back to the original page and I have to start again.

1 stop popping up stuff everytime i open firefox, thats why i left google in the first place

2 shut up about ai no human with an actual brain cares

3 fix the memory leak that has been a problem for maybe a little over a year now, no extensions installed firefox crashes on a regular basis when not in focus.

Fix these things and ill come back. Till then, im done downloading firefox for my systems and my customers. Its unstable and unusable... In a time where theres barely any other option.

Youre pissing your userbase off.

Sincerely,

Disappointed.

I have followed all the other recommendations with, no luck. I am on Windows 11 and use Eset virus software. Thunderbird is not listed as running it Task Manager, and there is no Profile.lock (think that was what it was called) in the profile directory, and I have deleted the existing profiles and recreated it. I have uninstalled and reinstall Thunderbird, and I have rebooted my computer. I am frustrated and concerned I will loose saved emails and my address book! Help.

I have just reinstalled Windows 10 and now I cannot see my old firex=ox history from prior to the reinstall of Windows 10 Is there a solution and also i downloaded firefox and now every tab crashes immediately

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?

I was attempting to use the Pinetools.com photo editing site on Firefox for Android, and it sent Firefox into a crash loop - I had to uninstall and reinstall. I was able to replicate this one more time. Here's exactly how it went down:

• went to https://pinetools.com/add-noise-image
• uploaded and filtered the photo
• "right"/long-clicked it to open the edit in a new tab, which immediately sent Firefox into a crash loop
• uninstalled and reinstalled Firefox when it became clear that closing the app wasn't solving the problem
• replicated the above steps, to the same result
• uninstalled and reinstalled Firefox again.

I have uBlock Origin and Privacy Badger, and reinstalled them both times - is there any chance I could have put my device/info at risk?

good morning , I am using a mac mini 8 gb ram and the latest ios, avg antivirus and vpn. Following the latest ios update in feb/2026 thunderbird opens then locks with a rotating color circle and force quit is needed to close it. Emails are via the imap and smtp protocols, with both not being recognised by the server. Can you help, I need access to files from thunderbird. Can this be done offline, avoiding the server problem. thank you for your help. Jeff

I had an issue where my browser disappeared. Here are specifics for my installation.

Name Firefox Version 142.0.1 Build ID 20250827004350 Distribution ID raspberrypios User Agent Mozilla/5.0 (X11; Linux x86_64; rv:142.0) Gecko/20100101 Firefox/142.0 OS Linux 6.12.62+rpt-rpi-2712 #1 SMP PREEMPT Debian 1:6.12.62-1+rpt1~bookworm (2026-01-19)

I relaunched and then restored previous session. After that, I searched open tabs, but when I selected a tab that was reported to be opened,  it was not restored. I went to troubleshooting mode and it worked fine suggesting some issue with an extension.  What, if any logs could I capture to help debug? thanks

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).