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Mozilla made an update of my Firefox installation on my Win11 laptop. all my password disappeared as well as my history and bookmarks.

I have now a virgin installation and is starting from scratch.

Now I get this error message: "This profile was last used with a newer version of this application. Please create a new profile." I deleted met shortcut and I opened Firefox by using Windows search. Now I see 4 profiles! I think I do not need to create a new profile. Maybe delete 3 of them ? What to do ? And, how?

I have my incoming IMAP emails stored on my local computer drive where the default Thunderbird installation puts it. This is fine.

My question is, can I move the local folders directory to another external drive or network attached storage? I am doing this as I have a small local SSD and combining all emails the size is massive.

Hi,

When I opened Firefox today, it asked me which profile I'd like to use. I named one Katy and then continued. Now, I can't see any of my bookmarks, none of my passwords are saved, none of my sites recognized. I've been using Firefox for years. Everything I have is saved there. I just want my old stuff back. I'm signed in on my account, but can't see another profile that I can choose. My phone still has all the passwords and bookmarks from before but I I can't see what profile I'm signed in under. Can anyone help?

Thank you!

Katy

Hi! I love Firefox, but on updates when my account signs out. I also lose all my Firefox profiles. Even when I sign in again, and sync everything on my Firefox account, I lose my primary and secondary profiles. Whilst it restores my bookmarks and extensions on my account. I lose my bookmarks etc. on my secondary profile.

I'm using FF on both Windows 11 and android, but this problem only effects Windows 11.

Cheers :)

I tried to transfer my Thunderbird e-mail account to a new Laptop. I followed the instructions for using an external harddrive. I copied my profile , connected the external harddrive to the new device and filled my profile in. But actually I don't find Thunderbird e-mail in the taskbar and I can't access to it. What do I have to do?

I have two personal Thunderbird accounts that were under two other email addresses on an old computer. They are [email1] @mlecwb.net and [email2] @mlecwb.net

Can I access them another way, since that computer is not working well enough to download emails? Plus the old email addresses will be disappearing with the the company l have the email addresses under.....

Then if I can get into the old messages, can I download and save some of the messages - or at least important ones in specific group files - onto another computer or a laptop? Or even on a CD?

Also, could I still use Thunderbird under another email address?

Susan Clark Harris [email3] @outlook.com

Believe my T-bird account has somehow been corrupted. Takes forever to load on PC and always puts new emails in Trash folder. Often does not accept correct password. If I save / backup PROFILE, uninstall T-Bird and delete any Thunderbird folders on PC, if I restore per backup, will I be restoring the corrupted app. Don't want to loose email addresses, thousands of emails and email folder structure. Will a restore work? Thank you. Greg D

PS Version of T-Bird on laptop still puts all new email in Trash, but loads much more quickly, etc.

I recently upgraded Thunderbird from v140.7-ESR to v147-Release and would be grateful if someone could answer some questions.

After upgrading I noticed there are 3 profile folders even though I am the only user of my Win11 laptop.

Profile Folders 92yfgi88.default-esr - 3.654 GB - 2026/01/23 12:50:27 >> My profile jf63jfuk.default-default - 1.533 GB - 2024/06/05 21:27:32 y9efj7q9.default - 47 Byte - 2026/01/23 12:30:15

The folder y9efj7q9.default only contains 2 files - parent.lock (0kb) and times.json (1kb).

1. Can I safely delete profiles I don't use?

2. Why is -ESR still shown at end of my profile folder name? - I thought it would be renamed when I changed to the release channel version.

3. Can I manually rename my profile folder? - I know I can rename a profile using Profile Manager but this doesn't rename the folder.

4. If not possible to rename my "92yfgi88.default-esr" folder, I assume I can just copy it's contents to another new profile folder and tell TBird to start using that?

5. Can I use Windows File Explorer to delete/rename profiles, or must this be done from within Thunderbird?

Also, any idea why Thunderbird Notifications still show as coming from Mozilla Thunderbird ESR, even though I now use the Release version? I've checked Windows 11 System > Notifications and it is still shown there as Mozilla Thunderbird ESR.. Why? and how to fix?

Thanks in advance..

I tried to transfer Thunderbird file from old computer to new computer but get "Profile cannot be loaded. It may be missing or inaccessable." when I start Thunderbird. The old TB file works on old computer and I am pretty sure I copied it and pasted it into the new location in place of the current Thunderbird file.

My toolbar disappeared in January very disappointed because I don't want to take my computer to the fix it man here in town when It was not something I did but rather came with an update.

I want to move my TB data store to a different drive but am unsure whether just to move the profile folder or all the other stuff like installs.ini as well. I have changed the datastore entry in settings, but do I need to modify the profiles.ini file as well, and if so what should it be changed to? At present it is in c:\users\mike\app data\roaming\thunderbird and I want it to go to D:\mail profiles. I'd be grateful for advice please. Thanks Mike Phillips

Help please I want to use "Personal Backup" program to save a backup of data needed to restore thenderbird Using tools>help>trouble shooting>application basics>profile>open folder gives 5 files all ending in .default 3 are 1 KB - can these be deleted? 2 have more folders each with many folders and files- are they both needed? which do I use for backing up with "Personal backup" program? the "Personal Backup" program finds 2 possble profiles defaultuser and default_user, which do I need? I am on the "release update channel"

opened firefox saturday and screen was totally different than what i had. guess it updated, but not returned to my profile. have tried to open my profile and succeeded, but can't get it to come on automatically when i open firefox again. how do i open the profile i want and then keep it opened?

As the title says, when i go to about:support, and click the open profile folder, i wanted to install a customization to allow me to edit the default tab background, but for some reason i do not have admin privileges in that folder, i can't access anything, i can't edit anything nor create a new folder, even rename it. It says that my own computer does not have admin privileges inside that folder.

I have moved my profile to a different location on the hard drive to make backups easier. How do I tell firefox where the profile is now located. c:\users\med\my data\PROFILES\mozillA\*.deFAUlt