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Hi, Is there a way to set up Thunderbird so that a thread of emails opens up in one window? Right now, every time I answer an email and get a response, TB opens up a tab for each separate email. I selected Open Message in an Existing Message Window in Settings, hoping that would solve it; but now it just opens a bunch of windows for each message. I just want one window that shows the thread of messages with the most recent response on top. Is that possible? I hate having to close 10 tabs every time I get an email.

Thanks.

Dear Support!

In order to index Thunderbird Emails in Copernic Desktop Search software, I need to install the “Thunderbird Connector for Copernic Desktop Search” in the Add-on and Themes menu. Unfortunately this Ad-don doesn’t seem to exist. Can you please suggest a solution?

Best Regards, Patrycja Wojcieszynska

I have a lot of Firefox windows and tabs open, and I really don't want to lose my session.

I wanted to open a webpage in Firefox in fullscreen mode. But evidently there's some kind of serious flaw in Firefox that makes it incapable of opening webpages in fullscreen mode. Everyone says the only workaround is to open the webpage in kiosk mode. So I tried it.

But now I have two big problems:

1. One of my Firefox windows, with all its tabs, is stuck in kiosk mode. (Even if I close the window and then restore it with Ctrl+Shift+T, it's still in kiosk mode.)

2. All new Firefox windows I open with Ctrl+N are also stuck in kiosk mode.

I don't know what to do, and I'd really appreciate any help. Thanks!

I used troubleshooting mode and now my fonts and columns settings are gone. I had replaced Recipients column with From and Recipient in all my mail folders (I have lots). And everything looks different now. Different fonts and smaller text size everywhere.

How do I get my previous settings back?

BTW, the Troubleshooting Mode dialog is confusing. It didn't seem to do any thing until I checked a check box which followed the blurb about making the changes permanent. So I may have accidentally asked it to make them permanent. Not sure because the UI was unclear what it was asking me to do. Why are there 2 separate dialogs popping up? Do I have to tick something to make it enter TbS mode? Not clear. (I am technical but not about the internals of TB.)

I do have backups of my TB folder but I would need direction as to what files I would need to restore.

Thanks!

Onboarding with RSS subscriptions for a couple weeks and can't make any sense out of the folder hierarchy structure.

• UI's folder structure & the Subscription settings folder structure screenshots included.
• Folder A seems logically coherent: a "folder full of feeds". Single folder in UI. Multiple feeds (3) show up in the queue
• Folder B structure starts to become much more incoherent

   - Feed's are actually folders now. Sometimes.
       + Feed1 & Feed3 = folders. But UI 'folder' displays just the one feed, as if it was a feed.
       + Feed2 = folder, with the 'actual' feed within it. But then it displays in the exact same way as Feeds 1 and 3
   - seem to have contradictions running in both directions.
       + If they are feeds, is confusing they display with folder icon
       + Not clear why a feed-as-a-folder would display exactly the same as a feed-within-a-folder

• "feed7" situation I can't understand to be anything other than a bug.

   - Subscribed to the feed within folder C. It instead shows up in the UI in Folder B. 
       + Which bafflingly *only* includes feed7, and does not roll up or aggregate any of the feed/folders (whatever they are) within it.

Like the integration of having RSS within Thunderbird, but need some clarification. Docs (https://support.mozilla.org/en-US/kb/how-subscribe-news-feeds-and-blogs#w_folders-and-accounts) were not of use.

Thanks.

I am experiencing strange behaviour with Thunderbird and certain add-ons. For some time now, when I use certain add-ons that are supposed to display a menu, the menu does not appear. It is replaced by a circle (see attached image : two different add-ons, not showing simultaneously, but merged into the same capture). I have disabled all other add-ons, but this has not resolved the issue. I think there must be a setting that is causing the problem. But with so many settings, I don't know where to look.

Does anyone know how to find the reason for this behaviour?

I am using Thunderbird 139.0.2 (64-bit) with Windows 11.

Thank you for helping.

When I log on to my laptop, Thunderbird always asks for my primary password even though I closed Thunderbird prior to shutting down the previous session. Since I don't always want to access my emails when I log on, I don't want Thunderbird opening automatically.

Under Settings --> General --> System Integration, "Always check to see if Thunderbird is the default mail client on startup" has a check mark. I believe that his was the default setting and I did not change it since I do want Thunderbird to be my default email client. Might this be the problem? I cannot find anything else in Settings that seems at all pertinent.

In the MacBook system settings, I do not have Thunderbird set to open at log in.

I appreciate any help you can give me.

The same question is from 2020. Today I had to reinstall but can't find a solution to switch to a readable light version. NOTE to developers. in SETTINGS is a section called "Language and Appearance." It should be here. The Dark Mode setting should be there - it would make hundreds of people happy.

Thanks for your help.

Updated recently from (I believe) 138.04 to 139.0.1, and immediately noticed that the size of font (and icons) had changed in the folders I have in the bookmark toolbar, that is they are much smaller and thus also less space between. Why this, and is it possible to change the size, without changing something else?

It's possible that many don't have folders in the toolbar and thus don't notice, but I have 2-3 apart from bookmarks.

I remember a change many versions ago that increased the space between entries in the bookmark menu, and also in the bookmark toolbar folders. That was too much and I found a setting [in config] that could be changed to decrease the space back then. (I haven't looked for that solution now, probably have some doc somewhere, and won't bother searching since this is different. Same with this case; I did some quick initial search but found next to nothing and older. BTW, this is one of the downsides of changes like these and similar; the day you have too move to another OS version, i.e. reinstall everything you also have to keep documentation of all these little changes, apart from all the other things you'll have to export or save.)

Dear Mozilla Firefox Developers, I am writing to request that you consider adding Ukrainian language support to Firefox's built-in web page translation tool. The Problem Currently, Firefox lacks the ability to translate web pages into Ukrainian. Ukrainian is not available in the list of supported languages for translation, and users have no way to add it manually through browser settings. Why This Matters

Large user base: Ukrainian is the native language of over 40 million people worldwide Information accessibility: Many Ukrainian users need to translate English and other foreign language content Competitiveness: Other browsers (such as Google Chrome) already support translation into Ukrainian Inclusivity: Adding Ukrainian language would make Firefox more accessible to Ukrainian-speaking users Injustice of current situation: Firefox includes Russian language - the language of an aggressor country that is waging war against Ukraine, bombing civilians, and occupying Ukrainian territories. Meanwhile, the language of the heroic Ukrainian people, who are defending their independence and democratic values, remains unavailable in the browser

Technical Feasibility Mozilla Firefox uses its own Firefox Translations tool based on machine learning technology. Given that quality machine translation systems for Ukrainian already exist (Google Translate, DeepL, and others), technical implementation of this feature is entirely feasible. Important note: If Firefox already supports Russian language, then adding Ukrainian should not present significant technical challenges, as both languages belong to the Slavic group and have similar linguistic characteristics. This makes the absence of Ukrainian even more puzzling. Our Request We ask you to consider:

Adding Ukrainian to the list of supported translation languages Ensuring quality translation from major European languages (English, German, French, Spanish, etc.) into Ukrainian Providing the ability to translate from Ukrainian into other languages

Benefits for Mozilla Adding Ukrainian language support would:

Expand Firefox's audience in Ukraine and among the Ukrainian diaspora Increase loyalty among existing users Demonstrate Mozilla's commitment to linguistic diversity and inclusivity Strengthen Firefox's market position in the region Show support for democratic values: Adding the language of people defending freedom and democracy would be positively received by the international community Make a morally correct decision: At a time when Ukraine is heroically resisting aggression, supporting the Ukrainian language would be an act of solidarity with the Ukrainian people

Alternative Solutions If full integration of Ukrainian requires significant resources, please consider:

Partnering with Ukrainian tech companies to develop a translation module Creating an API for integrating external translation services Adding an option to select external translation services in settings

Thank you for your attention to this matter and for your work in creating a better internet experience for all users. With respect and hope for a positive decision, useronelex!

Window's 11 Firefox. I'm trying to put, in setting Automatically install updates. I went to SETTINGS then GENERAL panel but there is no Firefox Updates section!! If someone can advise me what I can do? Thank you, Patti

The Thunderbird start page in the General Settings is set to open to this URL by default: https://live.thunderbird.net/%APP%/start?locale=%LOCALE%&version=%VERSION%&channel=%CHANNEL%&os=%OS%&buildid=%APPBUILDID%

However when I open Thunderbird there is a security alert in the web panel.

We are currently considering using Firefox ESR as our default browser but experiencing a few issues and one of them is with our configured SailPoint IdentityIQ Single Sign-On Experience, which uses Basic Authentication.

Issue Description First, the login button needs to be clicked multiple times before access to the site is granted. Once signed in, the Firefox inbuilt authentication dialogue appears, prompting the user to log in again (see the attached screenshot). The landing page is only presented after clicking the login button several times. This creates a poor user experience, sometimes causing pages to load improperly. Interestingly, the same process works seamlessly in Edge Chromium.

Troubleshooting Steps Taken I have already attempted the following: 1. Temporarily disabled all custom and security settings in mozilla.cfg and config.json. 2. Temporarily disabled Firefox Tracking Protection. 3. Allowed third-party cookies for the specific URL. 4. Upgraded Firefox Version to 128.7.0 5. Since our Firefox browser is significantly hardened, I have also enabled and reconfigured the following settings in mozilla.cfg to ensure Basic Authentication is allowed, functions properly, and suppresses Firefox’s authentication prompt, but without success:

network.http.phishy-userpass-length = 255 network.http.use-basic-auth network.automatic-ntlm-auth.allow-non-fqdn network.automatic-ntlm-auth.trusted-uris security.enterprise_roots.enabled security.enterprise_roots.enabled

Observations from SailPoint Team Our colleagues from SailPoint have tested the setup in their environment, and according to them, it works as expected. However, their browser is not hardened, and they have leveraged the SailPoint UI for authentication instead of the built-in Firefox authentication prompt.

Further Investigation • Is there a specific configuration required in the user profile settings? • Network trace analysis shows 404 errors on GET requests and the following error codes on POST requests: • 302 Redirect: Mozilla Documentation • 408 Request Timeout: Mozilla Documentation

Next Steps Is there a specific security setting that needs to be enabled or disabled? Are there any particular Firefox enterprise policies we should modify? I have also attached screenshots for reference. Let me know if you need specific logs or network traces for further troubleshooting.

LS. I have a laptop and a desktop. The Thunderbird filters I created on the laptop do not show up on the desktop and vice versa. I want the filters to be synchronized. Is that possible and how do I do that?

Kind regards, Mario.

As the question stated I have navigated to my mozilla profile folder, ( C:\Users\User\AppData\Roaming\Mozilla\Firefox\Profiles\pw1dnvcy.default-release ) but there is no file called persdict.dat. I have ensured all file name extensions are visible, & none are hidden in windows file explorer (Win 10). I am at al loss I cannot figure this out.

Cannot insert underlined hyperlink nor clipart into email using version 138.0 64 bit

Thunderbird makes it so difficult to fix settings anymore.

The config editor is a mess and unbelievable to understand what options are available and how to use them for anything speicifc.

I have backed up the data regularly before, but in the new Windows 11 pc, I cannot find the data.

It used to be "C:\Users\Jim\AppData\Roaming\Thunderbird\Profiles\itfho9h2.default" on the old Windows PC which went bonkers. Now should be "C:\Users\Jim\AppData\Roaming\Thunderbird\Profiles\i3ls19ra.default-esr", but when looking in the "C:\Users\Jim\AppData\Roaming\" folder, Thunderbird folder is not there with the others. But that is where Thunderbird data is supposed to be according to Account Settings, Message Storage, Local Directory.

So, how do I find where the data is so that I can back it up?

Thanks.

Sat. 04/19/2025 @9:10 am CDT - Hi. About 2 months ago on any Settings page, FF began to show "your browser is being managed by your organization." The problem is - it's a STANDALONE box, not connected to any network beyond my ISP. I do own websites but I'm not perpetually logged into the host company, so their switch to Microsoft Entra wouldn't have an effect, I would think.

What settings do I change to make FF know that I'm not on a network? Thanks in advance.