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Using Windows 11. I try to update from ESR (version 140.13) to the release path. It concludes with a pop-up saying I must "reboot to finish a Thunderbird de-install" (or words to that effect). I reboot and it hasn't done anything. Version 140.13ESR is still present and if I repeat the update to release, the same thing happens.

I fear if I use the W11 tools to de-install Thunderbird altogether before re-installing TB from scratch, I'll lose all my existing email.

How do I do it?

I am on release 140.12.1 esr and there appears to be no new updates available. If so, what release should I be on and can I just download and install to get back on the latest release

Currently, my Firefox Browser continues operating under Windows 10, without a known Windows 11, operating Browser update correction! Is there a solution to this problem?

I contacted Mozilla Support and was issued a ticket ID that is 438455!

Your help is greatly appreciated, Thanks.

Zdravím! Prakticky každé tri dni sú akési aktualizácie. Predtým bolo v nastaveniach všetko priehľadné, teraz ste to "poskrývali", že to musím hľadať, kde čo je! Nenávidím to !!

Chcem sa vrátiť o niekoľko verzií späť, kde to bolo jednoduché, priehľadné, skrátka fajn! Každou aktualizáciou to len komplikujete a komplikujete, viac a viac!

A potom "vyskakovacie okná". Tie vaše! Príklad: Pozerám youtube na malý screen. Ak si dám video na celý monitor, okamžite, asi na 5 sec. vyskočí okno - "youtube is now full screen". Robí to vždy, všade, pri všetkých videách, nielen na youtube, ak zmením formát na "full screen". Toto ma extrémne vytáča! Viete, ja som sprostý primitív, ja, ak si dám video na "full screen", ja to ešte potrebujem oznámiť vyskakovacím oknom! Niečo nenormálne! Napíšte mi, kde sa to dá v nastaveniach zmeniť! Alebo to zmeňte sami, keď tu každé tri dni robíte neustále aktualizácie! Ďakujem a dúfam, že sa z Vašej strany dočkám odpovede.

S pozdravom,

Jozef Varga ____________________________________________________________________________________________

Google translate:

Hello! Practically every three days there are some kind of updates. Before everything was transparent in the settings, now you "hid" it, that I have to look for it, where it is! I hate it!!

I want to go back a few versions, where it was simple, transparent, in short, great! With each update you just complicate and complicate it, more and more!

And then "pop-ups". Yours! Example: I'm watching youtube on a small screen. If I put a video on the whole monitor, immediately, for about 5 seconds. a window pops up - "youtube is now full screen". It does it always, everywhere, with all videos, not only on youtube, if I change the format to "full screen". This is extremely annoying to me! You know, I'm a stupid primitive, if I put a video on "full screen", I still need to notify it with a pop-up window! Something abnormal! Write to me where it can be changed in the settings! Or change it yourself, when you make constant updates here every three days! Thank you and I hope to hear from you.

Best regards,

Jozef Varga

Desired behaviour Please add an option that would make Firefox update only when:

• a) Firefox is completely closed — no open windows, no active profiles, no running `firefox.exe` processes of any kind.
• b) A Windows reboot or shutdown has occurred.

Current problem Currently, Firefox sometimes initiates an update while a session is still open — for example, when opening a new profile or seemingly at random. This interrupts active work and forces the update at an inconvenient time, meaning all tabs and workflow are disrupted.

Suggested improvements

• A good extra option could be modelled on Windows Update, which provides a series of delay settings.
• The update should wait until all `firefox.exe` processes have ended (currently, opening a new profile can trigger an update even with another profile running).
• A forced update that disrupts current work feels overly aggressive, especially when the update is not mission-critical. Even if it is critical, the timing should be a user choice.

Alternative approaches

• A selection could be provided to wait until the user has naturally finished, with all instances closed by choice, or until the computer is restarted after a Windows boot.
• A popup could appear with options to delay, or a notification saying "Update needed — please close browsers." There is no need to force this.

Workaround difficulty At present, the only way to achieve this is by writing a script. This overly aggressive update behavior could instead be controlled by a simple setting for advanced users. Being overly concerned about security to this level, should be a user choice not force. Turning it off and making it manual is still not as helpful as automation.

Great work, I just noticed this occurring several times in the few months mid session. All good wishes

Updating on June 20, the existing Thunderbird version in a flash of a second was replaced by a new blank one. All files and settings were lost. I needed an expert who (at cost of course!) managed to roll back the program with all files and settings as they were. This was a disaster, how can such effect happen? Right now I do not trust the updates anymore and will not implement new updates.

"Hello, I am using Thunderbird version 140.12.0 ESR 32-bit. I would like to install Thunderbird Setup 152.0. What are the advantages? Disadvantages? Is there a particular installation procedure?"

My folder header has many extra icons that when click do nothing -- happened when updating to 152.0 (and I need to hit ALT several times for the command line to appear to be able to "view folders" Tbird doesn't load to them automatically ! )

Here's a screen scape -- note the "what looks like a document" goes on and on and on if I scroll right

A few weeks ago my installation of Thunderbird on my Windows 10 laptop was version 151. I want to stop it from being updated, and I asked AI for help. It suggested the following:

1. Create a directory named "distribution" and locate it as follows: C:\Program Files\Mozilla Thunderbird\distribution. 2. Within that directory, I was asked to create a file named "policies.json" and I did so. 3. Within that file, I was asked to place the following: {

 "policies": { 
     "DisableAppUpdate": true 
  } 

} and that's what I did.

When I had a look under Settings > Update, there was a note to say that updates have been prevented by the administrator. (That would have been the effect of what I just did.) That was a few weeks ago.

So, when I looked at my version number today, I saw that my version is now 152. It had updated, and the directory and file I created are now no longer present.

It seems that the update process deletes anything that shouldn't be there and doesn't trouble itself with the file I created.

How do I stop Thunderbird from updating my installation?

Hi! I'm hoping you can help me! I use Thunderbird, and have for many years, and I love it. My computer is on its last legs, and I'm trying to save up for a new one, but, yesterday I did something possibly stupid... (yeah, I know, you NEVER get people asking for help who've done stupid things, so this will be unusual... lol). Anyway... I turned my computer on and got a popup saying that my Thunderbird needs an update and it's been a while since I updated, so I hit OK on the update... Well, my arsehole of a computer chose that exact minute to shit itself and die. When I tried restarting it, my Thunderbird no longer works. Now I have a popup with a big red X that says "The installation seems to be corrupt. Please check your hardware and disk setup and/or re-install." Can you help me? I desperately need to check my email and have one I need to send. I don't know what to do. I've also got YEARS worth of emails sitting in the system, so I can't risk losing them, either. Please help. L.

I'm trying to get the Enterprise Release Notes for Firefox 148 and 149. They seem to be the only ones missing from 141 to 151 inclusive. It appears the URL for the notes is in the format https://support.mozilla.org/en-US/kb/firefox-enterprise-###-release-notes/, where ### is the version. For these two versions, I get a "Page Not Found" error.

I have tried finding them through the Firefox Release Calendar (https://whattrainisitnow.com/calendar/). If you click on the link to expand previous releases and then click on a release version number, the page that comes up has links to the three different versions of release notes. Enterprise shows a link for the two missing versions in the same format as I have noted above.

I have also tried https://support.mozilla.org/en-US/products/firefox-enterprise/whats-new-firefox-enterprise and it lists quite a few versions but 148 and 149 are missing in action.

duplicate of /questions/1587271 thread

Dell recently re-installed my Firefox program but it seems to be an older version. Although I can find my bookmarks the bookmark toolbar is gone and that was a very handy feature. How do I update the program and get my toolbar back?

My reddit post is here: https://www.reddit.com/r/Thunderbird/s/lM11YcRIIT

Hello,

I'm confused and slightly concerned.

Through no deliberate action by me, Thunderbird DOWNGRADED itself from the May 2026 standard release version to an AUGUST 2025 ESR(Extended Support Release) version.

UPDATE: the next application restart brought the ESR version up to date, but why was I forced onto the ESR version?!

What could have pissibly triggered this? I don't want or need ESR, and without knowing the cause, I have e no guarantee it won't happen again. Worst if all, everywhere I look, there is zero explanation for this. It appears to be fairly unprecedented.

My original installer for 102.15.1 was downloaded from the official Thunderbird site in 2025.

The sequence of events:

• I've had Thunderbird version 102.15.1 installed for awhile, but wasn't using it.
• Ysterday I opened it and connected an account.
• Today I noticed it hadn't auto-updated, so I went into the settings and clicked on the 'check for updates'.
• this brought it up to v115.10.1.
• Its success was demonstrated by me being sent to this URL after it opened: https://www.thunderbird.net/en-US/thu.../?locale=en-US&version=115.10.1&channel=release&oldversion=102.15.1(https://www.thunderbird.net/en-US/thunderbird/115.0/whatsnew/?locale=en-US&version=115.10.1&channel=release&oldversion=102.15.1)
• An hour later, I closed Thunderbird completely hoping it would fix a sync that appeared 'stuck'.
• When I re-opened Thunderbird, I saw the small "updating" window. It was pretty surprising since I had *just* updated.
• After Thunderbird opens, after this additional "update", the URL that I'm sent to is this: https://www.thunderbird.net/en-US/thu.../?locale=en-US&version=128.14.0&channel=esr&oldversion=115.18.0(https://www.thunderbird.net/en-US/thunderbird/128.0/whatsnew/?locale=en-US&version=128.14.0&channel=esr&oldversion=115.18.0)
• Thunderbird changed to a year old ESR version!

Very simply as per the summary, every time I hit restart to update and then do another Help/About it ends up back with exactly the same result every time and while I downloaded the latest version available for download and installed it, it does not come up with 150.0.1 but the same as above.

I was sent the message: Your Firefox has been updated🎉 Celebrating 150 Firefox releases. It lists a lot of great things but I need to know if all those "great things" are free or do I have to pay for those perks. I do not understand most of what is being touted as great in the computer world, so I'm not sure if I want it or not.......