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My old Windows10 computer died, but I have an external backup with my Thunderbird profile folder. In the meantime, I have been able to resurrect an old Windows10 computer to continue receiving email, but was not successful transferring the backup profile. Thus, I have "new" profile on this second computer containing only the recent emails not in the backup profile.

I've purchased a new Windows11 computer. My question is: How can I merge my old emails in the backup profile with the recent emails received after the backup was made? In other words, is it possible to merge two separate profiles into one? Thanks.

Illinichip

I imported my bookmarks.json from another computer, via e.mail as I have always done for many years and used it to Restore my bookmarks.

As it has happened a few times before the restoring went apparently well and I can find my bookmarks in the Library (via Manage Bookmarks) but the toolbar is still showing the previous content evn after restarting Firefox.

As I have done in previous cases I looked up for the places.sqlite file but could find it.

Here is what I did find:

<startcode>

arthur-lifebooke743:[arthur]:~$ ls /home/arthur/.mozilla/firefox

cajynx3c.default-release   installs.ini      'Pending Pings'    profiles.ini

'Crash Reports' mfe5h239.default 'Profile Groups' arthur-lifebooke743:[arthur]:~$ ls /home/arthur/.mozilla/firefox/Profile\ Groups 4d0dfc77.sqlite 4d0dfc77.sqlite-shm 4d0dfc77.sqlite-wal arthur-lifebooke743:[arthur]:~$ ls /home/arthur/.mozilla/firefox/mfe5h239.default/ times.json arthur-lifebooke743:[arthur]:~$ ls /home/arthur/.mozilla/firefox/cajynx3c.default-release/ addons.json key4.db addonStartup.json.lz4 lock AlternateServices.bin logins-backup.json bookmarkbackups logins.json bounce-tracking-protection.sqlite minidumps broadcast-listeners.json notificationstore.json cert9.db permissions.sqlite compatibility.ini pkcs11.txt containers.json places.sqlite content-prefs.sqlite places.sqlite-shm cookies.sqlite places.sqlite-wal cookies.sqlite-wal prefs.js crashes protections.sqlite datareporting search.json.mozlz4 domain_to_categories.sqlite security_state domain_to_categories.sqlite-journal serviceworker.txt extension-preferences.json sessionCheckpoints.json extensions sessionstore-backups extension-settings.json settings extensions.json shield-preference-experiments.json extension-store SiteSecurityServiceState.bin extension-store-menus storage favicons.sqlite storage.sqlite favicons.sqlite-shm storage-sync-v2.sqlite favicons.sqlite-wal times.json formhistory.sqlite webappsstore.sqlite gmp-gmpopenh264 webappsstore.sqlite-wal handlers.json xulstore.json arthur-lifebooke743:[arthur]:~$ ls /home/arthur/.mozilla/firefox/cajynx3c.default-release/

<endcode>

My question is: "Should I delete </home/arthur/.mozilla/firefox/cajynx3c.default-release/places.sqlite> since there is no such file in the <Profile Group> folder?

Hello,

I received a popup tab about creating separate profiles. I am still not seeing an option to create another profile, in my case keep personal and work browsing separate on my work computer. The articles I have read do not seem to fit my situation. Firefox is up to date. Thank you for your help.

Do I have to be logged into an account to use profiles? I'm on my work computer on which I don't log into my account and "Profiles" option does not show up on my toolbar.

I'm on a Win 10 desktop. Version 140.3.1esr worked okay yesterday but when I started it this morning it is now missing my email accounts, folders, calendar, and contacts. Unfortunately I haven't done a backup in some time. The first image shows what I see.

The 2nd image shows that there are 2 profiles in the Thunderbird folder. The rc2jk0cq.default-release profile was created today & appears to have all of my data; it's the default profile. The v9w93tjh.default profile has an extensions folder and 3 files.

How can I recover from this?

Thanks

hi, I'm switching from 1 PC to another. I can download Thunderbird easily, however when I try to open, I get a popup saying profile missing. and I can't open Thunderbird. no idea what happened. any advice please? thank you! Jeff

I want to back up the Local and Roaming folders, in case something goes wrong. But I am getting an error code 80070057. I ran DISM Restore Health, but that did not change anything.

Hello, I have two profiles, one for work and one personal. I used two different email addresses for them. How can I merge these together for the new profile management?

I recently upgraded to Mac OS Tahoe 26.0.1 and opened Firefox as usual. None of my accounts are visible and when I try to follow instructions to go to settings and find my profile I cannot do that either. I cannot change the search location when the account settings window opens.

I thought to do an update but everytime I go there I get the message that Firefox is up to date.

Does anyone have a solution?

I am trying to install Thunderbird into a new computer with Windows 11. When I try to run, it goes to a configuration page but will not connect after finding my account. I have double-checked password, but it says "Unable to log in at server . . . ".

I have uninstalled and reinstalled new program, but get the same response each time. I want to install Thunderbird (and Firefox) and copy my profiles from my old computer to the new one. I am not able to do either. I have followed the online instructions for moving/migrating both, but neither work. Any suggestions?

Rad

I have multiple email accounts. I am able to locate my profile and can see the Mail account in the profile folder. Where can I find the mail for a folder in one of my accounts? For example an email address might be bill@nothere.com and the folder under that might be Bounces. Where would I find the mail that is in the Bounces folder?

Bonjour, J'ai essayé à plusieurs reprises d'installer Thunderbird (a chaque fois 1 don est requis) mais à chaque fois le même message s'affiche : "Le profil Thunderbird ne peut être chargé. Il est peut-être manquant ou inaccessible". Une première fois l'installation avait fonctionné mas j'ai essayé de modifier le profil afin qu'ils puissent reprendre le carnet existant sur mon ancien ordinateur. Aujourd'hui je suis bloqué. Avez vous 1 solution à me proposer ? Merci

My version of Firefox wont save History, Bookmarks or Downloads. I've made sure the privacy settings are correct and have tried reinstalling Firefox several times. It also wont let me drag a link from the address bar to the bookmark bar anymore like it used to. Any help with this would be much appreciated... Thanks!

The recent update to Firefox 144 seems to have completely broken my profiles. Previously, I had an additional profile that I could access and manage very easily from the about:profiles page.

After the update, clicking on "Launch profile in new browser" brings me to a completely blank screen. I can type in the search bar but after pressing enter absolutely nothing happens. (attached image)

I still have the data down the root directory. I tried following the instructions in this post https://support.mozilla.org/en-US/questions/1513880 to transfer my data to a new profile created from the new profile manager, but despite copying all the files from my old profile into the new one, absolutely nothing changed.

Honestly I would rather have the browser from the about:profiles page working again, but if that's not possible how do I transfer my profile data to the new profile manager?

I'm on windows 11, but I don't know why Firefox's troubleshooting page thinks I'm on Windows 10, if that matters.

How can I move Thunderbird 140 from Windows 10 to Windows 11 computer? The latest Thunderbird download is 143. But it doesn't recognize my copied profiles, in folders /Local and /Roaming. I have edited the profiles.ini to only see the one profile that I copied.

I migrated from Win10 (v140 ESR 32-bit) to Win11 (v143 64-bit). I copied both /Local and /Roaming folders. Thunderbird keeps showing “Account Setup.” profiles.ini contains two [Install...] blocks and I already removed them.

Can you help reset the install hash or rebuild the installs.ini file live with me? — that was a suggestion from a tech at JustAnswer.com

Thank you.

I don't have a Profiles menu under the Account button on the main toolbar. My Firefox was just updated and the update tab info talked about the new profiles feature as if it was available. Is this rolling out in phases or should I be seeing it?

I have version 144.0, updated on 10/14/2025.

Thanks.