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Since yesterday I have Thunderbird nebula 128.2.3esr on my Windows 10. But I cannot find my calendar and the new left sidebar isn't available, but only a little button on the left upper corner with seven button without function. I've tried a lot, I cannot find any description about a same failure in the Internet.

I've never knowingly installed a non-mainline thunderbird, but earlier this week I started getting the following when I open Thunderbird:

This is an unsupported version of Thunderbird!! Thunderbird monthly releases are not considered stable for general use. Use at your own risk, this build is the same quality as Thunderbird Beta.

Checking the version of thunderbird.exe It says its v131, which happens to be the same as the copy of Firefox installed. When I remove and reinstall Thunderbird it starts off as 128 but quickly changes to 131, even after uninstalling Firefox. (Also annoyingly, this stomps on the version in the profile, which 128 claims is no longer compatible, because Thunderbird isn't clever enough to save a copy of files when it makes "breaking" changes to user files)

I wouldn't being on 131 if actually worked, but it gets stuck in the handshake with my IMAP server, and doesn't even show the local folder caches. (It also for some reason shows the window controls on left side of the window title bar, rather than the right).

How can I restore standard functionality?

When I opened Thunderbird today, I was greeted by a giant red message warning, "This is an unsupported version of Thunderbird!! Thunderbird monthly releases are not considered stable for general use." By following a provided link to the "latest stable version of Thunderbird," I found that was version 128.3.0esr.

I did not request an update. I did have Settings> General> Updates set to "Automatically install updates", so I suppose that is how I got this version. But how was I pushed to an unsupported version? Do I need to turn off automatic installs to be protected from this in the future?

missing Thunderbird profiles: Thunderbird works on my windows 11 box but, ]\AppData\Roaming\Thunderbird\Profiles can't be found. I see others have the same issue, all recently uploaded as I am doing now, so something must have happened. None of the suggested fixes have helped. Has anyone come up with a strategy that works? Thanks for any help or direction.

Trying to install Firefox on my IPhone SE, 16,6. Get the message "cannot install because of limitations in settings for this unit". Which settings need to be changed?

Hey there! System: Windows 10 x64, Firefox Nightly.

Problem: Out of the blue, when I start Firefox Nightly (I think 2-3 days ago), it just crashed with no extra info. I see the "window of the update process", it goes to the middle or to the end, immediately closes and doesn't bring up the Crash reporter. However! When I tried to run a Nightly Installer that I downloaded through Chrome, it quietly runs and then just opens up my browser no problem, profile and all. I checked and it seems to be the exact same .exe file (according to the Task Manager).

So in short: it breaks if I run it straight from my usual shortcut, or with .exe. But if I run the installer myself, the browser opens up fine.

However, the installer didn't bring any new updates that would fix the problem, I have this for 2-3 days now, I don't remember. I start working, I see I didn't fix it and run the installer again.

Any ideas on the fix? I would love to not lose my profile, settings and, if possible, tabs. I'll try disabling all the extensions after I post this, I don't think they contribute, though (seeing how the external Firefox Nightly Installer opens up my browser just fine).

Thanks in advance!

Good morning, I am a cave man when it comes to all things computer so please bear with this simple question. Opened up T-bird e-mail and got a message that the monthly releases are not considered to be stable for general use and to download the latest stable version of T-Bird as it looks like something new was released in the last week? Would it be as simple as downloading the latest version/update? Will it be safe to do this or alter anything else on my computer besides going from the beta version to the latest stable version? Sorry for the trouble, but a little anxious downloading something that I'm not sure of. Thanks very much for the help.

Tony

Installed older version of Thunderbird (15) on top of newer version (120)>> lost access to profiles??

How can I now re-install 128? It won't download.

using Windows 10, HP 500-c60

I am currently on 133.0a1 (2024-10-04) (64-bit) Nightly and the new tab button to the right of the tabs is missing. It will show up sometimes, but I have to go to customize and move some things around, then start browsing and it will pop back up.

I use that button often, how do I get that back?

I'm using Firefox Developer Edition 132.0b2 (64-bit) and noticed that the only way to open a new tab is to click on the pancake icon and select new tab. The "+" icon in the tab bar is missing.

I also noticed that there is no way to reload the page (especially doing a hard reload). This is a major issue when making updates to websites and wanting to see those edit. Clicking in the address bar and then on enter will reload the page, but does not do a hard reload, so the cached version of the page is displayed, not the updates.

Good morning,

We are seeing that the key "DisableAppUpdate" being set to TRUE in about:policies. Not sure why this setting is being set. The result of the setting is "Updates disabled by your organization". So we cannot manually update firefox and are not sure why the setting is being set.

We used Procmon to capture logs:

Line 5169544: "2:29:45.2062951 AM","firefox.exe","1720","RegEnumValue","HKLM\SOFTWARE\Policies\Mozilla\Firefox","SUCCESS","Index: 0, Name: DisableAppUpdate, Type: REG_DWORD, Length: 4, Data: 1" Line 5169546: "2:29:45.2063211 AM","firefox.exe","1720","RegEnumValue","HKLM\SOFTWARE\Policies\Mozilla\Firefox","SUCCESS","Index: 0, Name: DisableAppUpdate, Type: REG_DWORD, Length: 4, Data: 1" Line 5169547: "2:29:45.2063338 AM","firefox.exe","1720","RegQueryValue","HKLM\SOFTWARE\Policies\Mozilla\Firefox\DisableAppUpdate","SUCCESS","Type: REG_DWORD, Length: 4, Data: 1" Line 5169548: "2:29:45.2063563 AM","firefox.exe","1720","RegQueryValue","HKLM\SOFTWARE\Policies\Mozilla\Firefox\DisableAppUpdate","SUCCESS","Type: REG_DWORD, Length: 4, Data: 1"

Is there anything in Firefox that can trigger the setting of this key?

My links on Firefox worked until I upgraded my Mac OS to Sequoia 15. Now the browser does not even get active and keeps buffering. Where is the problem and what can I do to solve it?

Thank you!

Just today after installing latest Microsoft Windows 10 64-bit and upgrading Thunderbird to 128.2, when I launch Thunderbird, after 30 to 60 seconds, the app goes "busy" with the hourglass pointer, and I have to kill and restart. Each time it still freezes after one mouse click. It has been working on this computer for months without problems until now. The only thing that changed was an update to the latest Microsoft preview WIndows 10 64bit from "Windows Update" a couple days ago.

Is this my system only, or are others having this freeze problem? I have to kill Thunderbird after waiting several minutes with it still frozen.

I don't want to change to another email program.

recently every time I open T Calendar I get annoying pop up 'Mozilla Thunderbird e-mail wants to access your google account........... then asking accept or deny - I don't use thunderbird email I use Outlook - but I enjoy the Thunderbird Calendar! - only started recently - was it in a update because I don't want to keep seeing it it is very annoying thanks so much

I recently updated to Ubuntu 24.04.01 and Thunderbird went from a debian version to being a snap version (128.2.3esr). Something clearly went wrong and Thunderbird was not added back to my dash (desktop), so I had to add it back in from apps. When I open Thunderbird it can't find any data and expects me to add all my email accounts from scratch. I tried renaming the profile directory and copied the old (non-snap) profile in it's place, but to no avail. It still acts as a "clean install". Can anyone give me an idea how I might fix it and restore my old mail accounts, please?