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It's very odd. Normally moving an email, say from the Inbox to the relevant year's archive, takes "no time at all".

Which is true for all the mailboxes shown on the attached screenshot, EXCEPT for the four at the bottom. Moving even one message from Inbox to Yiddish can take ten seconds or longer (with the dreaded "Not Responding" occasionally). Moving something in the opposite direction is also screwy, only from those four.

I had thought that it was because they're rather large. This first started when there were just Yiddish and MSW, and I split off most of the earlier years into the archives shown. To no avail.

It's only an annoyance, but I'm puzzled about how such a thing could happen.

Also very slow tagging or untagging a message just in those mailboxes.

Moderator Notes:

• need a performance profile https://support.mozilla.org/en-US/kb/profiling-thunderbird-performance

hi in a new win 10 instal most text incl Fire Fox text is made up of letters [font] that are made of thin and thick lines [in the same letter]

i dont know if its a strange font or another problem, i have copied all "font" setting from my other pc where i dont have the problem.

also i cant get spell check to work here dsespite turning it on

its very distracting, would be very gratefull for any suggestones if any one can 

help thanks

i have said many times that i keep getting Firefox running but not responding . i have contacted many places and complained had some of your r tech try and help now with the new update i am still getting it yet i was told it would be fixed. i have reinstalled i have removed and shut off some add ons cleared cache all but cookies and still i get it funny until the last 2 new versions i never had this problem it is a Firefox problem not mine. i would have thought you would have fixed it by now

Just installed TBird on new laptop, had an awful time. On the main mail page, across the top, there is a search bar (ctrl k). Should there be a 2nd one below it in the middle? Trying to configure it exactly like my older one, but can't find the right selections. Had remote help from BestBuy Geek, she only got half of it. The 2nd search bar is there, and tried to take a snap of it but can't get it. It has the threads symbol, the attached symbol, and one other on the left, and at the end of that line is the symbol to select them. She missed that completely. Can anyone tell me what that part is called, and where to make the selections from? (easier if I could show it to you, sorry) As always, Thank you! Stacy

In the Settings, the "HTTPS-Only" feature seems broken. There is an option to 'Don't enable" this feature, but that doesn't make any difference. I can get to an "http:" site using any other browser, but not with the latest Firefox.

The system was working fine. The next day, when starting Thunderbird (TB, the status line shows logging in to server but loops; no errors or messages, Thunderbird is 'locked out' spinning. I see the normal INBOX page, but logging in never completes. NO CHANGES were made to TB accounts or settings. I have re-installed TB, re-booted, but no change. I cannot check/change any of the accounts or do any further 'debugging' because TB is spinning. The server login is fine because Webmail can be used. Internet connection is fine, because browser works. 1. How can I stop TB from trying to login at start up? 2. What could/would cause this behaviour?

Any suggestions much appreciated.

I've been using Firefox for a while, and while there are many things I like about it, it has always been a resource hog. In the past I could get around this by just killing Firefox in Windows Resource Manager and restarting, but ever since getting a new computer an upgrading to Windows 11, it's gotten worse. Every couple of days my computer freezes for 10 or more minutes, I'm having to do a hard reboot ever few days, and I'm even bluescreening about twice a month. I'm pretty sure Firefox is the culprit because killing it will usually resolve the issue.

I'm wondering if there is some way to put Firefox in a sandbox so it does not consume nearly all available memory and other computer resources. It is by far the biggest consumer of resources on my system and I do not want to dedicate 4GB+ of memory to an app that is just showing a couple of web pages and playing YouTube videos.

Hello. I am not familiar with this end to end encryption that Facebook now does for Messenger but now when I try to use Video Calling/Chat it tells me it is not supported by my browser, Firefox. I have never had any problems with it before. Is there a fix? Thanks

I changed POP3 email password to an app password and Thunderbird would not recognize it even though I updated in Security. I was told to delete the Thunderbird account then set it back up which I did--I did not check the box to delete files. Finally the new account was able to bring in new emails (POP3) but the old folders/emails are not there.

I read that I should go to %appdata%, roaming, Thunderbird but the dates are from years ago--do I go further to find my data or is there another path or something else I should do?

Unless they were backed up somewhere within Thunderbird, I don't think I have any backup.

Can you please help? Thank you.

Suddenly I cannot search from the search bar. It defaults to the address bar. why "fix" something that was not broken. Being forced to use the address bar is frustrating. If you go directly to the address bar, it tells you it cannot find that site.

I have enabled the option to open the previous windows and tabs. I had one window that I always closed last as it had a lot of groups that are important for my work, so it used to open every time I started Firefox. Sometimes, even if I closed the window by mistake without closing other windows, I was able to get it back by pressing ctrl+shift+n.

But yesterday, I might have closed it by mistake and when I pressed ctrl+shift+n , it didn't come back. I wasn't able to access my window and now it's all gone. I don't see anything in recently closed windows in history.

I need those tabs back as they are very important for my work. they were a lot of tabs. I had many groups but now all are gone. I tried by using the previous.jsonlz4 in the sessionstore-backup by renaming it in the default-release profile as sesstionstore.jsonlz4 but still wasn't able to access my window.

I didn't clear my history as the tabs opened in the window still show up in the history.

Kindly help as soon as possible

I am losing my Mediacom ISP account (which I have had for 20 years) at the end of this month. I have used Mediacoms web mail server all this time and want to keep many emails and addresses that are on their server. I was told that Thunderbird would allow me to transfer/copy these messages to my computer and retain them there in Thunderbird after I no longer have access to Mediacoms server. I have installed Thunderbird 3 times and spent 2-3 days with help from this forum trying to gt it to work properly but have not succeeded. I have a windows 10 HP laptop and am not completely computer literate so I don't believe I will solve this by myself. I even loaded up an old windows 7 computer which I did with ver 15. but that didn't work either. THe one difference I did notice is that the Tbird auto installation on my Win 10 machine selects POP and on the Win 7 machine it selects IMAP. Mediacom is uses IMAP

I deleted my Thunderbird account and created a new one on the same computer. I used a Profile saved on my external hard drive. The address book info was replicated. The hierarchy of folders and their emails were not replicated in the left hand pane. Is there a way to retrieve those folders with their content? Please, I am not super techno-savvy, so take me step by step. Thank you.

Good morning. I opened up Firefox this morning and all 4 rows of shortcuts were missing. I have gone into settings and made sure the settings for 4 rows was still the same. I cannot find them anywhere. Please help

I had a problem where FF 140.0 would not update, and in trying to get FF yo update, I used a re-install tool to which I was pointed in my problem report. This caused FF to wipe out my configuration, and I lost all my windows and tabs. I have gone to

    \Appdata\Roaming\Mozilla\Firefox\Proifiles\abnfpged.default

cleared all of the data therein, and restored that directory from a backup I made last Monday. But I cannot get FF to use that directory. "about:profiles" shows only two profiles, but the Profiles directory has five profiles:

03/10/2026 09:39 AM <DIR> qf00ka5x.default 03/10/2026 09:39 AM <DIR> v842ceue.default-release 04/11/2026 09:16 PM <DIR> .. 04/11/2026 09:16 PM <DIR> . 04/12/2026 03:08 PM <DIR> abnfpged.default 04/12/2026 06:29 PM <DIR> jdfj91sd.default-release-1775960183850 04/12/2026 06:48 PM <DIR> f1jq4mlq.default

Only the profiles beginning with "j" and "f1" are seen in the "about:profiles" screenshot I have attached. And I have attached a screenshot of my profiles.ini file. Also, in the abnfpged.default directory I restored, where is the list of all of my open windows and tabs? FF used to keep that in a sessionstore.jsonlz4 file, but that file is only written when FF closes. I tried to save a copy when I was having problems, but I stored the copy in the same directory, which FF changed during the re-install process. Here is my profiles,.ini file:

[Install308046B0AF4A39CB] Default=Profiles/jdfj91sd.default-release-1775960183850 Locked=1

[Profile1] Name=default IsRelative=1 Path=Profiles/f1jq4mlq.default

[Profile0] Name=default-release IsRelative=1 Path=Profiles/jdfj91sd.default-release-1775960183850

[Install641D10338ABA448D] Default=Profiles/abnfpged.default Default=1 IsRelative=1 Locked=1

[General]

StartWithLastProfile=1

Version=2

[BackgroundTasksProfiles] MozillaBackgroundTask-308046B0AF4A39CB-defaultagent=lnvi5jn5.MozillaBackgroundTask-308046B0AF4A39CB-defaultagent

I have not worked with the ;profiles.ini file in many years, as my FF configuration has not had problems. Thanks.

In support.mozilla.org/questions/1598971 it's still not clear how you're getting this. You seem to be posting this question from a perfectly running Firefox so it apparently starts up and works fine on its own.

It sounds it's related to your Windows desktop shortcuts, or their exact target perhaps — however without knowing their content (destination or commands run) there's not much more to do here.

If you have anything new to add to the questions in the thread above, please post in that original thread so anyone trying to help understands what this pertains to. WELL LIKE I SAID I HAVE HAD THE SAME DESKTOP ITEMS FOREVER EVEN BACK ON WINDOWS 7 AND THIS HAS ONLY HAPPENED ONCE WHEN I FIRST STARTED WITH FIREFOX AND WAS TOLD THEN HOW R TO STOP IT AND BY THE WAY IT IIS NOT A NORMAL STARTING FIREFOX I GET IT WHEN I CLICK ON TH S THDESKTOP ITEM THERE ASWELL HOW COME ALL THIESES YRS HAVE HAD THE SAME DESKTOP ICOND S AND THIS ONLY STARTED ON THE 154.0 AND STILL ON THA 154.1 AND NOT BEFORE AND ITS ME NO I THINK IT IS A FIREFOX ISSUE . i HAVE Y USE THGE SAME DESKTOP AND FIREFOX SESKT OP FOR YRS AND NOTHING AND NOW IT HAPPENS WHY IS IT ME AND NOT FIREFOX//

I've been using Thunderbird for years at this point and it was fine, but then some time after the latest update I stopped getting new emails. I tried a bunch of random "solutions" I found on the internet and I don't remember exactly which one, but eventually I got the web portal to pop up, and it showed that I'm logged out of all my accounts (they all gmail, btw). Using this windows I was able to log back into one of them, but then it didn't popped up again to let me to log into others. For a day or so I was getting email from that one account I logged back into, but then again, suddenly, no new emails. I decided to just start over on a new profile and that's where things went from bad to worse. Now I can't even get past the initial logging process. It gives me "unable to log in at sever" over and over, no matter what I try. I tried a bunch of different config suggestions, I tried the old school way of getting a device password, I've checked if localhost was running something - it wasn't. I tried uninstalling and reinstalling, installing an older esr version (I'm on Win10, thought maybe that has something to do with it) - same thing. Unable to log in at server. I can switch back to my old profile that doesn't get any emails anymore, I've backed it up, but what's the point. Kinda feeling screwed on all fronts here.

Also, whoever is replying to people on reddit with "thunderbird employee" badge, ghosted me after one message. Great support /sarcasm.

Version: latest (whatever auto updated updated to) and 140.8.1esr OS: win10. Mail provider: gmail.