Just to confirm that it is still updating to 131 after roughly a day. I tried to remove one more program that I suspected might be doing background updates, but it still happened. I also have a colleague with the same problem.

Please let me know if I can provide any other useful information to resolve this issue. Thanks!

In Thunderbird Settings > General Scroll down to 'Updates' section Click on 'Show update History' Increase the size of window as much as possible. Please post an image showing us what it says.

Events sequence: Installed 128 two days ago Update to 131 silently yesterday Attached: update history today

Events sequence: Installed 128 two days ago Update to 131 silently yesterday Attached: update history today

It only shows the one update and not a history of updates. That's interesting.

Please try this: Settings > General scroll to bottom and click on 'Config Editor' It opens in a new tab called 'Advanced Preferences' In search type : update

look for : app.update.channel Make sure it says: esr Click on the pencil icon on the right to 'Edit' Completely remove contents and type: esr Then clickon the tick icon to save.

Look for: app.update.log Make sure it says true. There is a toggle icon on the right.

Tell us if you needed to edit those two.

Leave this tab open so it should be already open in a tab after the next process.

Exit Thunderbird. Do the process again to get the 128 version back.

Then immediately check this this: Look at the tab you opened via 'Config Editor' called 'Advanced Preferences' In search type : update

look for : app.update.channel Make sure it says: esr

Look for: app.update.log Make sure it says true.

Please report back on whether you still see the above or whether you had to alter them.

The app.update.channel seems to not be modifiable. It is grayed out (c.f. screenshot). Also, it says 'release'.

Also, app.update.log was set to False. I know put it on True. But the app.update.channel is not modifiable.

Did you receive my reply? It said a moderator needs to approve.

Basically: app.update.channel is set to release and cannot be changed (the crayon is grayed out) app.update.log is set to false. I put it on true.

I will reply again:

I tried the proposed solution, but the app.update.channel cannot be changed (it is grayed out). It is also set to release. I could change the app.update.log from False to True.

.....

re :app.update.channel is set to release and cannot be changed (the crayon is grayed out)

Thanks for info. I'll try to find out why you have a 'locked' preference which is set on 'release'. This may explain the issue.

Exit Thunderbird.

Then go through the process to uninstall the 131 version and reinstall the 128* ESR version BUT do not start Thunderbird.

Access Profile name folder Remove the 'compatibility.ini' file from profile

Access the location where the Thunderbird program is installed. Look for the folder called 'pref'. In Mac OS X, I think it might be here: /Applications/Thunderbird.app Note the following may be true...To open one of these folders, Ctrl-click or maybe right click it and select 'Show Package Contents'. If you simply click it, you will start the application which you do not want.

In /Thunderbird.app/defaults/pref folder, it should contain a file called 'channel-prefs.js' Open that file using Notepad or other simple text editor.

Between the lines - Do you have the following text in that file:

/* This Source Code Form is subject to the terms of the Mozilla Public

* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */

pref("app.update.channel", "esr");

What do you see ?

I see pref("app.update.channel", "esr"); If you see pref("app.update.channel", "release"); - edit the 'release' to say 'esr' then save the file. Start Thunderbird See if the preference 'app.update.channel' is now saying 'esr' or 'release' and report on whether it is still 'locked'.

This is now a bit confusing, because I did not find the file at all. Here a summary of what I did:

1- uninstall thunderbird (put it in to the bin, empty the bin, restart the mac) 2- download from https://www.thunderbird.net/en-US/thunderbird/all/ the Thunberbird extented support release 3- install by using the downloaded .dmg file 4- go to /application/thunderbird/contents

No folders /default/ or /pref/ exist, and not file channel-prefs.js is found. The only related file I found is a Unix executable Applications/Thunderbird.app/Contents/Frameworks/ChannelPrefs.framework/ChannelPrefs .

5. I oppened Thunderbird to check nevertheless the configuration. The app.update.channel is locked and set on esr and app.update.auto is set to false.

Any idea how to solve this problem? It is really annoying as it breaks the calendar which depends on the use of extensions that are not compatible with 131.