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Hello, Mozilla community.

I am trying to configure a Firefox ESR installation so that every new user on a computer automatically receives a visual customization (a logo change on about:home) through userChrome.css and userContent.css files.

My goal is to do this without using Group Policy (GPO) or logon scripts, by only modifying the files in the Firefox installation folder.

Environment:

Firefox Version: Firefox ESR 140.3.0esr

Operating System: Windows 11 Pro

Context: Standalone machine, managed without Active Directory.

My Question:

Is this method of deploying a default profile via installation files (defaults/profile or distribution.ini) still supported in recent versions of Firefox ESR?

Is there an additional step or configuration I am missing for Firefox to recognize and use the bundled profile when creating a user's first profile?

Is there any policy in policies.json that could be interfering or that is required to enable this behavior?

Thank you very much for your help and your time.

How can I transfer my bookmarks to the new version of Firefox. The bookmarks are still available from the drop-down top bar "bookmarks" but they don't show on the Firefox page. I don't know how to get to the "about:profiles" page to change back to the profile that shows my bookmarks toolbar.

Hello,

For a few days now, my Thunderbird has been reset. It asks me to set up an e-mail account. And all my old accounts and e-mails have disappeared. But the profile folder isn't empty. I've tried a number of solutions on the Internet, but still nothing. Please help me. Thanks

HELP!!

I am trying to move my Thunderbird profile (containing a huge number of mail files dating back to 1995!!) from a Windows 10 computer to a new Windows 11 computer. My active profile has been kept in my Documents file (for easier automatic cloud backup). I have spent days trying everything I can to make this work. The best I can do is two profiles, one that can check mail, but contains no historic mail or files -- the other that has all my emails but won't connect with my server. "The following is a special account." "There are no identities associated with it." I was wondering if I could merge these two profiles? Or?

Any assistance will be greatly appreciated!!!!!!!!

I'm trying to transfer the Profile folder from my current laptop to my new one. I followed the directions here: https://support.mozilla.org/en-US/kb/moving-thunderbird-data-to-a-new-computer but must've made a mistake because none of my many Local folders have populated Thunderbird in the new laptop. Also, the GB size, number of files and number of folders show to be very different on the new laptop vs. the current one.

I'm inclined to just start over but have a question. Can I simply delete the contents of the "Thunderbird" folder under "Roaming" in my new laptop and try again to paste into it? Or are there some items in that folder that were inserted when I first downloaded TB into my new laptop so that doing a complete deletion would remove those and they wouldn't be replaced when I try pasting again? If so, how do I get around that?

Thanks very much for your help.

I have a folder/subfolder, Old Firefox Data/ukn05f6l.default-release, on my desktop created 11/30/2024.

Any ideas what it is? It is huge...940mb.

Can I delete it?

Thanks

I am having trouble moving Thunderbird data from one computer to another. The first computer is Windows 10 32-bit that has been running T-Bird 140.3.0esr for several years. The second is Windows 11 64-bit running T-Bird's latest version. I tried both procedures cited in the Mozilla article at https://support.mozilla.org/en-US/kb/moving-thunderbird-data-to-a-new-computer.

I first did the 2nd method cited -- Win 10 to Win 11. It worked but the new computer is missing Local Folders and contacts organized as groups.

I then did the 1st procedure cited, using copy and paste commands. It did not work at all and now T-Bird will not load. I get this message: "Your Thunderbird profile cannot be loaded. It may be missing or inaccessible."

So, different operating systems with different bit specs and different T-Bird versions.

I thought of updating the Win 10 computer to T-Bird's current version and then doing the Win-10-to-Win-11 copy/move procedure but thought it best to ask here first. Thanks for any help.

Basically the title. With TB closed when there were no tabs open, I have located the profiles on the win10 PC in c:\users\[user]\AppData\Roaming\Thunderbird and copied said folder onto a USB stick, then pasted it from the USB stick into the same location on the target (win11) PC (and apparently according to the progress panel everything was pasted as it should). On the target PC, Thunderbird does open, but in the default account definition tab (and creates a default-esr profile along the way), but does not find the profiles I copied onto the target PC. I really need the existing mails and folder structure. Thanks in advance!

I am buying a new PC. I would like a 'blank' TB on this machine so I can replan the folders and the email address books. I'd like the current copy on my current PC to be moved to the new PC such that I can access it as I do now but- like a 'sleeping' copy - ie just there to access the emails and address book occasionally/when needed, but not receive new emails.

This will give me a fresh start on the new TB on a new PC, and will save me having to clean up the old TB version. Is this possible? Thankyou

Can I safely access my Profile, which is on a Windows partition, when I am using Thunderbird under Linux (Fedora) on a different partition?

My computer is set up to dual boot using Windows 10 and Fedora Linux. I use Thunderbird and access my emails using POP3.

I use Windows most of the time and therefore my Thunderbird profile is on the Windows partition. But when I'm using Linux I sometimes like to be able to access my emails using Thunderbird. I have set up access in the Linux Thunderbird profile so that it points to my profile that is on the Windows partition.

In some earlier versions of Thunderbird that were around in 2022, I found that if I used Linux to open Thunderbird I could access my profile that was on the Windows partition and read and send emails, but then when I rebooted to Windows and tried to run Thunderbird, I found that my profile was broken and Thunderbird under Windows could not get to my emails.

But, confusingly, with some versions of Thunderbird, the Linux version of Thunderbird did not break my profile on the Windows partition.

I tried asking questions about this issue on the Forum back in 2022 but I received answers saying that what I was trying to do was very "dangerous" and I should not even attempt it (even though it did work sometimes with some versions of Thunderbird).

The last time I tried this was in 2022, and I have not tried it since then.

So, my question is "Is Thunderbird robust enough to allow me to access my Windows Thunderbird profile when I am running Thunderbird using Linux (Fedora) on a different partition?

Hi ... I have carefully followed the instructions but when Icopy and paste ihe file involved - it seems to transfer - but NO PROMPT to overwrite appears. What might I be doing wrong?

Hello. I have tried to backup my Thunderbird profile and simply cannot find it. Using Thunderbird 140.3.1esr(64bit) on mt laptop (Windows11 version 24H2 - fully updated). I have gone through all of the suggestions using T'bird help/troubleshooting and export to show profile folder. The profile file name is shown but annotated as "Unavailable". Gone through looking for hidden files and cannot find it. Even did a complete file search to no avail. Thunderbird works fine so the profile folder must be somewhere.

I hope you can help.  Steve

I am trying to set up a profile however when I click the account icon the profiles menu item does not show up like it says on the manage firefox profiles guide. I am updated to latest firefox version.

Hello,

I need to purchase a new PC because my old PC was not compliant with Windows 11. I've installed Thunderbird and copied over my data, profiles, etc.

I've noticed that there is folder added to my offline Documents folder called "Thunderbird" and in this is another folder and a file.

Is this normal?

Thank you,

Gordon

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!

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?

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'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