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11/1 I had dozens of folders, thousands of e-mail, and probably two dozen rules. It was all gone. I restored connection with my vendor's IMAP server and after a day of downloading everything. It took so long I never was able to work. 11/2 I brought up Thunderbird to see what looked like a full Inbox, but no folders. I also had my rules restored. Again, several thousand e-mail had to be downloaded, since only their subjects displayed but no content when any message was clicked. 11/3 I was unable to work, so today 11/4 I opened Thunderbird to see my account with profile details (server info, etc), but no folders, e-mail, nor rules, but no response when I try to download e-mail. Testing the server link succeeds. I do not understand some of these articles on profile, since I have nothing they seem to refer to. I think I see a profile (original???), but Thunderbird doesn't seem to. Account is complete...

I have been a happy Firefox user for decades but I am about to junk it. Why? I keep my profiles on a separate external drive. That way I can just go from my laptop to my desktop and leave off where I was. I also don't take up GGGBytes on my default hard drive. However, Firefox knows better. Use "Profiles - Manage Profiles" or restore a profile from a backup, and all of my precious profile is lost and put in a random folder on my hard drive, exactly what I DO NOT WANT. Then there is the "Can’t delete a profile that is linked to other profiles" nonsense ... Please let ME decide how to run my profiles. I don't want to dig into Firefox code, I don't want to become the world's expert on how and where it keeps my passwords. I just want it to work.

I am a bit of a noob, and probably out of my depth, so please bear with me. It also is a bit of a confusing situation so I hope that I can explain it clearly.

A while ago, Thunderbird stopped working. Whenever I tried starting it up, I got an error message saying that Thunderbird wasn't responding. I thought there might be a problem with some update so I decided that I would reinstall the program. As I went to back up my profile, I found out that there were actually two profile folders where in the past I would only find one. I chose to back up both, and procede with de- and re-installing Thunderbird. After doing so I tried to integrate the old profiles back into the new installation. At first, I chose the largest of the to profile maps and copied it where I found it before the re-installation. I created a new profile using the old profile folder through the User Profile menu. This seemed to work! However, I noticed something. I have two e-mail accounts running in this profile. One IMAP and one POP. I noticed that the POP account was missing about a years worth of old e-mails. As if it stopped saving them at some point. I figured they must be in the other profile folder I found before the re-installation. I tried creating a new profile with this profile but when starting up Thunderbird afterwards I once again got the 'Thunderbird isn't responding' message. So I reverted back to the first profile I made, the one with the missing e-mails. Appart from those e-mails, it seemed to be working well. To get back what was missing, I tried copying the files in the "inbox.sbd" of the back up that wasn't responding into the back up that was responding, thinking that if it messed something up, I could just CTRL + Z my way out of trouble. It seemed that there were three locations in the functioning back up that I could copy the files into, each having the server name of the e-mail account that I was missing e-mails from. I tried copying the files in each of them, each time removing the files through 'undo' before trying the next location. As this seemed unsuccesfull I tried restarting Thunderbird again (having removed the copied files from all locations) which resulted in the following error message:

In a pink screen that I have never seen before. After this I tried removing all profiles and starting again with a fresh copy of the backed up profile folder as I figured I might have accidentally changed something in the profile folder I was using. This however keeps giving the same error message.

Clearly, I messed something up. But I don't know what. Can anybody help? One last thing I noticed that in the 'Mail' folder within the profile folder, there where three folders with the server name before, now there is only one. I guess this is a clue?

All help is welcome!

I am still running Windows 10, but as of yesterday every time I open Thunderbird it resets my settings and spends hours re-downloading every email that I have. It constantly tells me that the connection to the server has failed and that all my passwords are wrong. Nothing is wrong with the server and none of my passwords are incorrect. After about 2 hrs, it completely re-downloads every email (I have multiple accounts) and I can continue to work like nothing was ever wrong in the first place. However, if I close out the program, it starts all over again. It randomly picks an email account and requires that I start from scratch and reset them up. Other times they are there like nothing happened. I have restarted my computer multiple times, it continues to do this.

Essentially, I want to back up my Thunderbird. The standard way seems to be via Export / Import, but there is an implied limit of 2GB. The export function has successfully ended and produced a file of 15GB. Can I rely on this? (In the sense of being able to Import it should I need to?

Thanks in advance for any help / advice you can give.

(I am a Chinese and English is not my native language, so please forgive my grammar or vocabulary errors) I was doing my programing test in class and the Tab Edit profile pop up, at the same time the theme of my browser changed. I didn`t want that changing so I clicked the Delete button. In the following few seconds nothing happened so I just put it aside and continued my examination (it was on a website and I need to sign in). And then suddenly, my browser was closed. When I opened it again, it didn`t recover any of my tabs. I tried to open my previous tabs and found that my history was empty, and when I returned to my examination and try to login, I found that even my passwords were all deleted. What was happened? how to recover my tabs and my passwords? I just don`t want to change my Theme why every thing was deleted? (and also, why Support service in Chinese is not available?)

I was not able to boot up my Thunderbird email client and had to reload it. But after I got it going, I realized there are many missing folders, and there is a lot of missing messages in my "sent" folder. Why?

I was trying to figure out how to remove a totally different feature, and I guess I accidentally created a profile or something. After I fixed my original issue, I looked up regarding this issue, and I found a way to get rid of the 'profile' I created. Now I have this annoying button on application menu, and it is messing up how I interact with it. Please tell me there is a way to remove it.

最近、リリース版Thunderbird 157.0.1にアップデートしたら、今までの①アドレス帳、及び②送信メールデータが全部消えてしまった。その後、リリース版を削除して従来の通常版をバージョンを再インスト―ルしたが、今までの①アドレス帳、及び②送信メールデータは出てこない。ついては、この2つのデータを復元する方法を教えてください。 よろしくお願いします。

Am I seriously supposed to enter windows safe mode to delete this folder, my machine requires a bitlocker password for me to enter safe mode in windows. I could probably do it, but I do not understand why I have to go through this insane process to remove a folder from my desktop.

I cant believe this software is capable of making a completely unremovable folder on my desktop, I don't have permission to remove a folder from my own computer? Seriously? I'm supposed to go into recovery mode in windows just to delete some firefox folder? THIS IS INSANE.

I tried restarting, changing permissions, I get access denied error. Is there anything else I can do?

Bonjour,

Mon PC W10 m'a lâché et me voici sous ...W11......j'avoue que pour le moment on n'est pas copain/copain !

Voici ma question : Firefox est installé, mais quand je vais dans "Profiles", j'ai le contenu du dossier xxxxxxxx.default qui s'affiche mais pas le dossier !!! Comment procéder ???

De plus "profiles.ini" me semble bien bizarre ...à quoi doit-il ressembler ????

Merci pour votre aide et bon WE @ TLM

Who decided to attach everything in my browser to a profile that can be easily deleted???!?!?!? Just lost all of my work shit because I tried to turn off this dumb feature I wasn't using and now everything is gone!!! History, passwords, bookmarks, sessions, everything! Never even created any profile, the browser just updated and necxt day all of my settings were tied to this dumb bullshit. Stop moving all of my data without notice or permission.

Almost locked my out of my work email because it thinks this is a different device now!!!!!!! [expressing disappointment]

Quick breakdown: I had my old boss's email loaded in Thunderbird for a short while Didn't want to be invasive after project ended Removed profile from Thunderbird Then Shaw and Rogers Merged - Sold email service too 3rd party Easy-On-Net Easy On Net dropped the ball and all of the historic folders and contents were lost when Shaw/Rogers severed their connection Can I recover up until the point I disconnected his old profile?

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.

Again, folloed Mozilla Support directions from Konstantina Papadea of 10/22. I could not type or paste anything to then get to "Enter/Return". Could not get to "About Profiles".

I did get a warning page from Webroot that there "might" be security issues. Please advise.

Hello! After a Windows 10 update (around September 5, 2026), Thunderbird stopped receiving Gmail messages. Laptop: Dell, Windows 10. Account: Gmail. The problem occurs both in Russia and abroad. My emails were organized into a folder structure created inside Thunderbird. The most important thing for me is to restore this internal folder structure with all its messages. What we tried: • We kept the old Thunderbird profile folder as a backup and created a new profile. • In the new profile we switched the account to POP3 so that emails are stored on the computer. • Thunderbird downloaded the emails, but only up to a certain date (around 2023). Newer messages did not download. • The old folder structure did not appear in the new profile. Thunderbird version: [version]. Authentication method: [OAuth2 / normal password]. Error message: [error text]. Could you please advise: 1. How to restore my old folder structure from the saved profile folder? 2. How to make Thunderbird download all emails, including the recent ones, and keep receiving new mail? Thank you!

Hi, hoping someone could help as I am struggling to get my information back. I am using Ubuntu Cinnamon.

Thunderbird crashed last night, wouldn't work, tried safe mode. Nothing fixed it. It hung when opening up and after 30 seconds said force quit. So I was forced to reinstall. I did a manual backup but not using the inbuilt tool as I couldn't get into Thunderbird. I just copied the data from username/.thunderbird

After spending a long time uninstalling. Because it reached 78% and then crashed on uninstall. Eventually after reading various pages on the internet I managed to reinstall from the Ubuntu software manager using the latest snap version. (Which I am not sure was what was actually installed previously).

However having used thunderbird for nearly 20 years or so. I have a username/.thunderbird folder. And when I moved to this platform, I have a snap/thunderbird/common/.thunderbird folder.

I installed this new distro 2 years ago, and remember having issues getting my data into the system under Snap. But eventually got it to work somehow back then.

However since reinstalling I cannot see the last 2 years of emails, archives or data. It has launched into a 2 year old profile. I appear to have lost most of the emails from the archive folders (but kept the folders) removed all of the personal folders but then dumped all those emails into my inbox. Giving me 6500 emails that were in various personal folders. (I don't get 6500 emails in a year so don't know what has happened.) It has even changed all of the new dates to the US format, so nothing makes any sense.

I now have 2 Thunderbird profiles, over 12GB in size. And have apparently lost 2 years of my life. But reading support pages, suggests I should be okay because thunderbird doesn't delete data when you reinstall?

I have looked through various other threads which talk about pointing it at the profiles and mail boxes, however nothing works.

Any help much needed.

Once again the latest firefox browser has issues so I rolled back the last stable version. It keeps prompting me to create a new profile. I want to use the previous profile that has all my setting and bookmarks. I got to about:profiles and selected the profile i want to make default and it will not add it to firefox. How can I do this?