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I have no idea what happened to my Thunderbird. I think it might have been an update, because all of my folders are not where they were, everything in the folders are sorted by groups like today, or older. I noticed a bunch of my emails are now in folders marked as a Userfolder#. The emails it contains are those that normally should be in a properly named folder, only those named folders are grayed out. Another issue is that when i try to open an email, it opens it as if I want to reply to it. If I just want to read the email, I have to right click on the email and select open to read it. I have 2 spam folders, no idea why, nothing saves to my draft folder I found out today, I just dont know what happened! I dont think I did anything but I dont know now, as Im beginning to doubt myself. It's been this way for a few days.

If I type a date for example 24th October, Thunderbird changes what I type to T4th, if I type 22nd, it changes to N2nd, the 5th becomes Tth and so on, I have tried all sorts but I cannot find a fix apart from typing the 22 then leave a space, type th then go back and delete the space, then I have what I want. Also if I press ctrl+B to type in Bold, and let's say I type R9.88, the program changes that to a capital B, and dumps my cursor in the next line, again I have tried all sorts and can't get that fixed.

Lastly, I have done my signature using Account Settings, Signature Text, I have ticked the "Use HTML" and typed my text in three lines, my signature shows as a single line with only a space between.

So, Kind regards Mark Collings Telephone Number Shows as Kind regards Mark Collings Telephone Number.

Can you give guidance and solutions please

This morning, all of the right click feature have disappeared and the only options I get when I right click on a page is "Send to mobile." Gone are copy, paste, screenshot, etc.

A vertical blue line/bar has appeared between the folder icon and the folder name. I can change the icon colour in properties for a folder but the blue bar stays blue. It is blue regardless of the state of messages in the folder (whether read or unread). Is it possibly related to the bug where Thunderbird tries to update every time I open T? But help says T is up to date. The blue line does not appear on my wife's Thunderbird running the same software version under a different profile. It is very annoying not knowing why it is there and what it means. Thanks

It appears that when I invert the sorting order of messages by Date, it does not affect the order of messages in a threaded conversation.

Is this deliberate or a known issue?

Any solution to sort everything with the newest messages at the top, that is: - Messages - And messages within a thread

Thanks!

Thunderbird by design changes Outlook deleted folder to trash.

Problem with this is that you end up with 2 trash folders.

One for Thunderbird and one from Outlook.

Chnage this so Thunderbird does not change Outlook deleted folder name.

Dear Firefox Support Team,

We are evaluating the deployment of Mozilla Firefox Group Policy templates in our organization to support Microsoft Defender for Endpoint Network Protection.

Microsoft has advised us that, for custom URL/domain Indicators to work correctly in Firefox, we need to:

1. Download the Firefox policy templates from:

  https://github.com/mozilla/policy-templates/releases

2. Copy the files and folders under the Windows directory to:

  `C:\Windows\PolicyDefinitions`

3. Enable the **Disable Encrypted Client Hello** policy.

4. Configure the following preference to disable HTTP/3:

```json {

 "network.http.http3.enable": {
   "Value": false,
   "Status": "default"
 }

} ```

Microsoft referred us to Mozilla for clarification regarding the lifecycle, compatibility and rollback of the Firefox policy templates. Before deploying the configuration across our managed Windows devices, we would appreciate your guidance on the following questions.

1. Policy template update frequency

We noticed that new versions of the Firefox policy templates are released quite frequently.

• Is it necessary to deploy every new version of the policy templates?
• Should organizations establish a regular schedule for updating the ADMX/ADML files?
• Alternatively, should the templates only be updated when a required policy has changed or when the installed Firefox version requires a newer template?
• Is there a recommended method for matching a policy-template version with Firefox Release and Firefox ESR versions?
• Could an older policy-template version continue to be used if it already contains the required policies?

2. Different Firefox versions across endpoints

Our users may have different versions of Firefox or Firefox ESR installed.

If the same policy templates and settings are deployed to all managed Windows devices:

• What happens when an installed Firefox version does not support a setting included in the policy template?
• Will Firefox simply ignore an unsupported policy, or could it cause policy-processing errors or browser compatibility issues?
• Is there a minimum supported Firefox or Firefox ESR version for `DisableEncryptedClientHello` and the `network.http.http3.enable` preference?
• Do you recommend targeting the deployment according to the installed Firefox version?

3. Devices without Firefox installed

Some managed devices do not have Firefox installed.

• Is it safe to deploy the Firefox ADMX/ADML files and related registry-based policy settings to those devices?
• Will the files and settings remain inactive until Firefox is installed?
• Could deploying the templates or registry settings have any effect on Windows or other browsers?

4. Replacement of existing templates

When copying the files into `C:\Windows\PolicyDefinitions`, Windows may prompt us to replace existing Mozilla ADMX/ADML files.

• Is it safe to replace older versions with the latest released templates?
• Could replacement affect or remove existing Firefox Group Policy configurations?
• Should the existing files be backed up before replacement?
• Do we only need `mozilla.admx`, `firefox.admx` and the corresponding language-specific ADML files, or should every file and language folder in the Windows package be copied?

5. Rollback procedure

If the deployment causes an unexpected browser, compatibility or performance issue, what is Mozilla’s recommended rollback procedure?

Should we:

• Change **Disable Encrypted Client Hello** to *Not Configured* or *Disabled*;
• Remove or reverse the `network.http.http3.enable` preference;
• Remove the associated Firefox policy registry values;
• Restore the previous ADMX/ADML files; and/or
• Remove the current templates from `C:\Windows\PolicyDefinitions`?

Please clarify whether withdrawing the Group Policy assignment is sufficient to restore Firefox’s default ECH and HTTP/3 behavior, or whether endpoint-level cleanup is also required.

6. Recommended enterprise deployment approach

For a managed enterprise environment, would Mozilla recommend deploying these templates through:

• The Active Directory Group Policy Central Store;
• Local `C:\Windows\PolicyDefinitions`;
• Microsoft Intune ADMX ingestion;
• Direct registry-based policies; or
• Another supported method?

We would appreciate Mozilla’s official recommendation so that we can complete our internal risk assessment and prepare an appropriate deployment, maintenance and rollback plan.

Thank you for your assistance.

Best regards, Summer

I am using Ubuntu Linux on a desktop PC running Firefox in kiosk mode going to a specific web page - Every time Firefox does an update (since version 147) the kiosk mode stops working. The very latest update, after a reboot, just shows the menu bars and not Firefox going to that specified web page. Has the kiosk code changed since v147 ?

Thunderbird normally displays the number of messages in a folder, near the top of the screen above the list of messages. But somehow, clicking around, I lost that display of the message count and cannot get it back. Wondering if anyone knows how to get that number back, get it show up near the top of the screen. I'm using version 156.0.

I upgraded to 156 and the new tab informs me of a new ad-blocker feature. It tells me to open Settings - Browing - Ad Blocker. I did that and that option is not appearing!

whilst all incoming emails are visible, many do not display their message header in the Inbox List. such as the one captured with a screen shot. Several have displayed in this manner over the last few days as can be seen.