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Ever since a few weeks ago, some of my add-ons as well as every new add-on I added after that are unavailable at the start of Firefox. I then have to click into the application menu, click on the warning message for that add-on and enable it again. Since this is quite tedious and frustrating, I tried looking online for any info. I tried updating everything, disabling and enabling manually and removed and re-added some if the add-ons that cause issues.

I am loath to set up a fresh profile or reset all add-ons as that would cost a lot of time to configure everything again. In hopes of a solution that avoids that I am asking here now.

I have followed the instructions, 'How to move Thunderbird data to another computer' and all seemed to work well copying from old computer (Win10) until I came to save to a USB drive to Paste into the new computer (Win11). I then got an error message indicating: Inbox too large -9.02GB nstmp too large - 4.5GB Sent too large - 7.3GB

I am not sure whether all my accounts were being moved or just the most-used one which is probably the source of the error message.

Is there a way to copy the files mentioned seperately and the paste them into the new installation after deleting the content before going through the procedure again? It does look as though the process failed as following the paste, there are no accounts in the Win11 computer, just the basic install 'awaiting setup'. You may have another solution - hope so - and thanks in advance.

Hello. I am trying to download and install Thunderbird to my Windows 10 desktop. I can't seem to be able to download the app. It does not appear in my Explorer Downloads window. Every time I try to download it from the website a Donate Window appears and there is no option to Continue - even though I have donated to this site. Please advise. Thanks.

I *think* I've followed the instructions, but I am unsuccessful in moving Thunderbird Profile to new PC. I copied old profile to external drive. I opened Thunderbird on new PC and found Profile folder. I went up 3 levels and pasted old profile from external drive into folder on new PC. But my old data have not moved. When I go into new Thunderbird and choose "open profile folder", it shows me 3 files: the two that the system created in the new download, plus the old Profile that I pasted there. The new version of Thunderbird uses the "new download" profile as the default. What am I doing wrong? Thanx!

I've used Thunderbird for years, and I LOVE it! A few days ago, my hard drive died. I had it replaced, and I've used my data backup to recover much. I did NOT have programs/apps backed up. I need VERY SPECIFIC steps to download and reinstall Thunderbird so that it uses my old profile. Should I first delete EVERYTHING having to do with Thunderbird and start anew? I did download it today and then went to the C:Users/Owner/AppData/Roaming/Thunderbird folder. In that folder, I deleted the "new" profile file (I think!). Then I moved my backed up folder called Profiles into that directory. I tried to get Thunderbird to use that profile, but no luck. I'm reasonably intelligent (I've been told!), but I can't figure how to do this, and I truly need a step-by-step blueprint. Do I download Thunderbird first? If so, what do I then do to make it find the old profile. I'm running Windows 11 Home on a PC. Right now, I'm going for a long walk to clear my brain. In the interim, if one of you really smart, nice experts could give me instructions on how to do this, I'd be eternally grateful. I have numerous folders, and some really important old emails in that old profile. I also would like to be able to retrieve my address book and calendars ... which I ASSUME are part of the old profile. Thanks in advance for ANY assistance! Don't assume I know ANYTHING!!

I have a mid-2012 Macbook Pro that works very well. I have no reason to replace it other than to have access to newer versions of applications, which so far I've not needed.

Does the March 2025 Firefox end-of-life dealine mean I simply will not be able to use Firefox anymore? I'm certainly not going to buy a whole new computer just to use a newer version of Firefox.

Bonjour, J'ai en permanence thunderbird qui me met " ne répond pas" je suis obligé de fermer et ré-ouvrir. JE ne comprends pas d’où vient le problème. Je l'ai réinstallé entièrement.

Why is moZilla forcing me to use Google Play Store to download Firefox? I used to be able to go directly to mozilla and get it (and yes i'm talking also about the android version)

Trying to set up Thunderbird but details not accepted. Have updated Apple password for icloud email account but can't get any further. Have hit brick wall!

Please help!

Hello, When I want to backup my profile, i get an error because the profile folder does not exist. In fact, there is no Thunderbird folder in c:\Users\danie\AppData\Roaming. I found this folder and all my data inside the folder C:\Users\danie\AppData\Local\Packages\MozillaThunderbird.MZLA_h5892qc0xkpca\LocalCache\Roaming\. My Thunderbird is running fine, except that I cannot backup my profile (as it does not exist). The folder when my profile is located currently seems to be a cache folder and I scare that it disappears when the cache will be cleared out. Please help me.

New system, new install of Thunderbird. I get the following error :

[GFX1-]: RenderCompositorSWGL failed mapping default framebuffer, no dt [GFX1-]: glxtest: DRM render node not clearly detectable. Falling back to using the only one that was found.

Thunderbird seems to work okay, but this is annoying.

Having posted that I was unable to get an email account working on Thunderbird. In frustration I removed it and reinstalled. Now its seems when I try to open it, it says the app cannot be found. It seems to have got worse and worse as the day goes on

So now even when downloading I cant open it. All this whilst trying to negotiate Windows 11 for the first time. I cant find the Thunderbird profile on the PC either.... so much easier with W10

Any ideas?

I have a new PC. I'm trying to get Thunderbird working on my new PC. I have the old and the new running next to each other and the settings on both Thunderbird set ups is the same. However on the new PC all I get is "unable to log in at server probably wrong configuration or password. Given that the password is correct, what possibly could I be doing wrong"

Just installed Mozilla Thunderbird on my new Dell Win 11 laptop. I can only run it by typing it in the Win-R line. I cannot find any folders or executables on the laptop. Appreciate any help you can give me. Want to get this settled before I try to move my Win 10 Thunderbird Profile file over.

Thanks

I was auto-updated overnight to 128.6ESR 32-bit. My unit is Windows 11 64-bit. When I called up the program later, it did not load my profile of 35GB, neither its accounts nor folders nor email records. What do I do to retrieve the profile?

Hi. On an Active Directory, we deploy Firefox (normal or ESR). It's OK. When we deactivate the link of the GPO, it's supposed to uninstall. But it doesn't (even if we delete the GPO, specifying to uninstall at once).

The gpresult command on each computer doesn't show the GPO anymore, but Firefox is still installed.

( FYI, we used to do that with FrontMotion Community Edition, and it was always working (instal and uninstal). We even just tried the "last" (but old) ESR edition present on the FrontMotion site (CEESR-102), and it works. But FM CE version has stopped being developped. )

So, any idea about why the official Mozilla Firefox version (normal or ESR) doesn't uninstall?

Thanks by advance.

Hi,

I need to roll back from Thunderbird 135.0 (Release Channel) to 128.7.0 (Extended Support Release) without losing any data. However, I am receiving a message about creating a new profile due to compatibility reasons.

I would like to downgrade while maintaining a seamless experience, ideally with just a few clicks. This Thunderbird e-mail client is used in an operational environment. Could you guide me on how to do this?

Alternatively, is there a way to get my add-ons working again on version 135.0?

I also find Thunderbird’s handling of add-ons across different versions quite frustrating. The frequent compatibility issues between versions create unnecessary problems. Is there any plan to make this process more flexible in the future?

Thanks in advance for your help!