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Hi, I have been running low on hard disk space due to the bloated Windows 11. I have been trying to clean up Thunderbird by deleting a bunch of saved emails and compacting, but the size of my profile folder is still about 3.5 GB. I looked at all of the subfolders under my profile and found a bunch of what I think is dead storage.

Under the MAIL folder there are 4 folders for what looks like my current Local Folders and 3 older local folders. Under the IMAPMAIL folder there are 4 folders for what looks like my 2 current email addresses and 2 older unused email addresses.

I looked under the account settings for the Local Folders and the 2 email addresses and have identified the 3 out of the 8 folders that are still being used.

So my question is, is it safe to just delete these apparently unused folders?

7-1-26: Problem when I updated/downloaded Thunderbird 152.0.1. When I try to open, a dialog box asks if I want to create a new profile. By mistake I clicked the "new profile button" but didn't create a new profile since I want to use my previous profile just as with past upgrades. However, I couldn't move past that screen so I closed Thunderbird. Then when I try to re-open Thunderbird, I get that same dialog box and can't move forward. What can I do? Your assistance is truly appreciated, Rick

First, I have very limited understanding of software. I need very simple explanations.

Here's my issue. I use Thunderbird on my desktop computer. I have used the Import/Export > Options > Backup Scheduling function to backup my Thunderbird email to my USB/flash drive. I have labelled the backup folder on my flash drive "Thunderbird email backup." That folder contains numerous subfolders including: 1) calendar-data 2) chrome_debugger_profile 3) crashes 4) datareporting 5) extensions 6) ExternalMailFolders 7) Mail 8) minidumps 9) saved-telemetry-pings 10) scheduled-notifications 11) settings 12) shader-cache 13) storage.

Again, these are the subfolders created/named by the Thunderbird Import/Export backup. I HAVE NO IDEA WHAT THESE FOLDERS MEAN.

Here's what I want - it's actually very simple. I want to be able to see (read) my backed up email on my flash drive without using the Thunderbird installed on my computer. I want complete interaction with the backed up email without my desktop Thunderbird - or my online email account - being involved at all.

My understanding is that Thunderbird Portable is supposed to be able to allow me to do that. I downloaded Thunderbird Portable (from https://portableapps.com) to my flash drive but when I tried to access it the first thing it did was try to force me to put in my online account (POP?) information.

I don't want to do that. I just want to open Thunderbird Portable on the flash drive and have it realize that all of my backed up Thunderbird email information is right there in the same flash drive. I want it to just access and use what's right there.

I was really hoping that Thunderbird Portable would simply ask me where to look - in a very user-friendly way! - and I could tell it to go to my "Thunderbird email backup" folder on my flash drive (WHERE ALL MY THUNDERBIRD INFO IS!) and it would simply do just that and provide me with complete Thunderbird service for the backed up email.

Am I missing something? Can someone give me a VERY SIMPLE walk through to do what I would think should be a very simple thing? Thank you. Chris (6/29/26)

PS - I've read the Mozilla Support ARTICLE: Thunderbird Portable (Mozilla Thunderbird, Portable Edition) and other portable apps as alternatives (https://support.mozilla.org/en-US/questions/1285834) and it alludes in general terms to exactly what I want to do but it does not give any step-wise instructions.

When I try to edit a profile (name, color theme), about:editprofile returns a blank page.

It was working just a few minutes ago, but stopped while I was trying to select a new theme.

I've restarted the browser a couple of times and looked at help articles but cannot figure out how to fix it.

I used to have Thunderbird on this laptop and was using Microsoft Office 365. I have since stopped using it from GoDaddy. I uninstalled the old Thunderbird and reinstalled a new version. I am trying to enter the new server settings but I keep getting the old Office 365 settings showing up. How do I get rid of that and find the new settings page to enter the new settings?

All my old email accounts are showing up and I only want to add 2 to the new Thunderbird. I thought uninstalling would delete all the old stuff. Please help.

I thought original profile would save all my bookmarks, history, passwords, etc. I created a second profile for work, but that also does not contain any of my bookmarks, history, passwords, etc. I imported my bookmarks and other history/passwords from EDGE. I did this in my work profile because I couldn't get my original profile to import anything. I signed into work with my main firefox e-mail and exported bookmarks to HTML so I could upload it in my original profile. The original profile now wont log in and says I need a different e-mail account, so I'll lose everything on my original profile. It is ridiculous that my profiles don't have the same log on and don't use the same e-mail. I need someone to help me recover my system to normal working function. This has been a horrible experience and profiles are unusable.

I created a user profile for IMAP and all was OK....Until I deleted the profile for POP and I lost all e-mail folders that I didn't move to IMAP. My PC is running Linux Mint. How do I get my lost e-mails?

Hi everyone,

My antivirus as quarantined 2 files from my TB profile:

• d:\internet profiles\thunderbird\profiles\z3rq1w7t.default\prefs.js
• d:\internet profiles\thunderbird\profiles\z3rq1w7t.default\virtualfolders.dat

I asked the antivirus to restore them, but the damage is done. TB has lost track of everything I’d stored over the years, including my email accounts, emails, preferences, etc. It’s like a fresh install.

But I can see that my profile still contains about 5 bg of data. So everything’s there, but it seems it no longer knows how to access it.

As you can see, my profile isn’t buried in the depths of Windows; it’s on my D drive. Perhaps I just need to ‘reconnect’ TB to the correct profile, but I don’t know how to do that anymore…

Any help would be greatly appreciated.

Thanks in advance. Guy

Hey all,

at shell:startup on windows i will open firefox two times (first for multimedia like tv-stream and maston, second for "working activities" like webmail, office online).

How can i open by file explorer link (like in shell:startup) a new tab (newspaper) everytime in instance "first" even if i was using second at last?

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.

I'm trying to trim down my hard drive, and I see that my Profiles folder has 2 ImapMail subfolders. In the first of them, imap-gmail, I have 14 All Mail files numbered "-1" to "-13" plus the most recent All Mail (today's date), unnumbered. Most of these All Mail files are quite large. Can I delete all of them except the most recent, unnumbered one? In the second subfolder, imap-gmail1, the files are all from before 2025, and instead of multiple "All Mail" files I have multiple "rstmp" files. What's the deal? Can I delete this whole folder? Is it a backup? Thanks for your help. FYI, I'm up to date in Windows 11 and Thunderbird, with a fairly new computer. I hope I've provided enough into. Looking forward to your help. all the best, Steve

I'm asking this question so I can post some helpful information for people wanting to create a backup of their profile.

If you are using Windows OS and you got your download from the official website: https://www.thunderbird.net/en-US/thunderbird/all/

How do you locate the correct folder to backup? The backup must contain everything, profiles, mail accounts, emails, address books, calendar, preferences - the lot. The backup can be used to transfer between computers.

I'm a Chinese firefox user, so the following descriptions are translated and may not be so accurate. And the attached image is also Chinese, if necessary please use a translation app or somewhat to see it. I have only one default profile in my Firefox account, and I have stored a large number of passwords and bookmarks in this default profile. For certain reasons, I signed out of this profile while retaining the local data such as passwords—meaning that, apart from not being logged in, my browser state remains exactly the same as before. Now I wish to sign back in to enable synchronization. I can see a "Sync and Save Data" button prompting me to log in. After clicking this button, I am asked to enter my username and password, but then I receive a message stating that I have reached the account limit for this profile, and that this profile was previously synced to another account. This is absurd, as I do not have another account, nor have I ever synced this profile to any so-called other account. As a result, I am unable to sign in on this current profile.

After some Windows Updates installation, my computer behaved very erratically, and I had to reset it. After selecting the option to keep all files, it appears to be a joke, as I have ended up having to reinstall almost everything. Regarding Thunderbird, all the files have disappeared including the folder with the profiles, however I did a back of that folder on a separate disk and I need to know if that can be used and how to go about it.

Updated to FF 150 today on Win 11 desktop.

Q1: Can I remove Profiles from the FF toolbar which is located in between Bookmarks and Tools? Only need one profile on this PC. I tried to customize the toolbar but it won't let me drag Profiles off.

Q2: For some reason my FF profile is now on C: even though I had previously moved it to D: to free up space on C: boot drive.

So I created a new profile with exact same folder name on my D: drive today.

In Profile Manager, I renamed the old profile on C: to "name.old and the new one on D: to "name.new". I set name.new as the default profile and it works properly after exiting and restarting FF.

Now I want to delete the .old profile but FF won't left me, saying Can’t delete a profile that is linked to other profiles. There are only the .old and .new profiles listed. So how do I unlink .old so I can delete all of it to free up space on C: ?

Yes, I'd like to use the same account on both of my profiles.

I understand that for some users, this may be confusing.

In my case, the only reason for different profiles is that I need to use a Proxy Server for some websites, and no proxy for other websites. Manually switching proxy settings is painful, and doing so causes traffic for my other tabs/windows to go to the proxy, which I do not want.

I have a main (set of) windows (and its tabs) going straight to the internet, then I have a separate window (and its tabs) configured to go through a proxy (SOCKS5 in this case). I want all other settings, bookmarks, passwords, etc. to be identical to both. I end up having to logout of my main profile, log into the other profile to sync settings, log out of there, and log back into my main profile.

Is there a valid technical reason why an account on the same FireFox installation cannot be shared between two profiles?

I can do this on multiple computers (same account, different computers/profile), seems odd it is restricted to not allow on the same computer.

I have an alternative solution: Install FireFox natively, then install FireFox as AUR or FlatPak, but not sure this will collide as this both uses the same profile directory. Hum...

Wayne