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I have lost Open message in conversation for my emails, We have 2 main computers & 1 still has it , but mine lost ( have asked my tech guy & spent several hours on this ) , currently , I have to walk to the other computer to use this VERY usefuil , normal ability

I can't read the trail of emails that have been sent so very tricky

Cheers , Very much Craig

I have a couple of folders I use a lot in my email account, and I regularly need to dig into them. The desktop lets a user favorite a folder to its sidebar for fast access. Can the Android app do similar?

I don't think I have the only decisive factor when switching from Chrome/Chromium-based browsers to Firefox - this is precisely the lack of support for web progressive applications. They are very convenient to use those sites that people use every day (YouTube, Reddit, Canva, Figma, GitHub, ProtonDB, etc.). I would really like you to add such mechanics from chromium-based browsers - this would change the situation very much when choosing "which browser to use?". I'm a Linux user, particularly Fedora, so I'm often helped by PWAs to use the same Instagram, Canva, Figma, GitHub, Reverso Context and others as if they were separate applications on a computer. This is much more convenient than keeping everything in tabs in the browser. Do not ignore my request, please! I would really like this mechanics in the browser

Today firefox changes theme and startpage everytime i startup, i have tried resync theme and settings, and turn off sync, and try remove startcash, and tried falesafe start, still the same.. and now i saw that firefox color addon was enabled by startup also.. should have something to do with the new update? The problem seems to be solved, perhaps it was firefox color being enabled by startup..

When i compose an email in TB i have to go back and correct. When i use Outlook 2019 (now possibly migrating to TB and / or Betterbird) i never have this issue as it always corrects the "i" to "I" when creating a sentence using UK language and dictionary pack settings. Why can't i do this with TB when composing.

Is there a setting for this. Many thanks in advance.

I REALLY don't want to see prompts like this ... when FF upgrades to a newer release. I postponed clicking on adding this application since I really didn't know what it as going to do, or how to remove it once done. The little 'i' in the red circle did nothing. So - I finally clicked on it to make it go away. Not hat I call a very seamless upgrade.

Desktop Windows 11 Thunderbird 156.0.1

I have configured the message columns in the Message List pane for all the folders the way I want them. Unfortunately, Thunderbird frequently changes the columns in some, but not all, of the folders back to the default column configuration.

To temporarily fix this, I click on the column picker button in the folder that has the column configuration I want and select "Apply columns to > Folders and its children > " my top level folder. I also repeat this and select "Apply current view to > Folders and its children >" my top level folder. Sometimes this corrects the column organization in all my folders, but I usually have to repeat the above procedure multiple times to get the columns arranged the way I want them in ALL my folders. This lasts a few days before Thunderbird again returns the message columns in SOME of my folders to the default configuration. I then have to repeat the above procedure multiple times to get them the way I want, only to have to do this again in a few days.

How do I stop Thunderbird from making these changes, or how do I change the default column setting to the way I want it, not the way Thunderbird wants it?

This is not a new issue for me. I've been dealing with this for quite some time over many Thunderbird versions.

Hi. I am finding the scroll bar to the right of Thunderbird's main window very narrow and hard to spot where the cursor is located. Does anyone know if it can be made large, please?

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

When you go to the "Help and Support" section, a link for transferring data to another device appears. It clashes with the overall design and is annoying. Please remove it.

Hi,

I used to scroll up in current message using Shift+Space, but it stopped working for a few days now. it's not mentionned in moving around TB, so I don't know if it was normal behaviour or a feature added by TB's arch maintainer.

How do I make Thunderbird open a new window instead of another tab? When I open a PDF file, setting, address book, or other, it always goes to a new tab. When I want to close this file, I often forget it's a tab and close the whole program! Annoying! I want these thing to open in new windows instead where I can hit close without shutting down Thunderbird.

Hello, We are in Morocco, where Time zone has become GMT+00 or UTC after the 20th Sept 2026, the IANA has already published this change within 2026c update, but Firefox browser desktop still using GMT+1 for Africa/Casablanca time zone.

I've installed the latest Firefox desktop update until now : 156.0.1 (64-bit)

test : console.log("Detected IANA zone:", Intl.DateTimeFormat().resolvedOptions().timeZone); console.log("Date.toString():", new Date().toString()); console.log("getTimezoneOffset() (minutes):", new Date().getTimezoneOffset());

result: Detected IANA zone: Africa/Casablanca debugger eval code:1:9 Date.toString(): Sun Sep 27 2026 13:41:40 GMT+0100 (GMT+01:00) debugger eval code:2:9 getTimezoneOffset() (minutes): -60