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I can access addons.thunderbird.net with Firefox without any problems or being asked to "verify you are human by completing the action below.", yet when I try to access it from Thunderbird's add-ons manager, I am asked to complete the captcha, which after about 30 seconds of "Verifying you are human. This may take a few seconds." goes back to "verify you are human by completing the action below." I tried troubleshoot mode to no avail, I am not using a VPN or anything like that.

Hi. I play free sweepstakes and continually get messages that I am using an ad blocker. Need some help where to find the ad blocker so I can disable or remove it. Thanks

Hello, I have a problem with one email account. Grouping does not affect it. It does not group... Everything was OK but I changed the POP server address to MAIL for a moment and then back to POP. Since then the account has not grouped. I want to have all the mailboxes "received" together. What could be the reason that this one account does not group and it used to group?

I'm opted in to studies, but unable to toggle the switch to opt-out because it is "grayed out" (screenshot attached).

Cannot find any studies-related solution in existing community Q&A except for one that says to toggle the switch to opt out, which isn't an option for me.

Thanks in advance!

On various websites with embedded podcasts, when the file goes past 1h the volume 'slider' goes away and becomes a basic mute/unmute button. How can i force Firefox to always display the volume slider?

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.

Mozilla's documentation on IMAP Synchronization Mozilla's documentation on IMAP Synchronization indicates

"Non-synchronized messages are still accessible within Thunderbird. The only difference is that rather than downloading the entire message, only the message "headers" are downloaded. (Message headers contain information like the sender, recipient(s), subject, etc - everything except the body of the message.) The message body is not downloaded until you click on the message in the message list"

Under what settings (e.g. Sync messages checked or unchecked) does this behavior apply?

Thanks.

I have 4 email accounts setup in Thunderbird. When I turn my laptop on and open the program all the email accounts automatically expand(open to show their folders). I then have scroll up thru all the accounts and folders to get back to the top account. If I don't shut down or reboot they will stay closed or go back to what state they were in when last closed. If I reboot or turn on pc again they all expand.

I shut down and boot many times a day when moving around the office or on calls. So it kinda annoys me and slows me down. I cant seem to find a setting that fixes this if it is even possible. I want them to stay closed till I open them.

When I receive some special html formatted email e.g. from ticket system like Zendesk they look like this: https://assets-prod.sumo.prod.webservices.mozgcp.net/media/uploads/images/2025-06-17-01-06-32-c4ca42.png

When I want to reply to the text stays at the blue colored background and the text would be hard to read and it looks ugly: https://assets-prod.sumo.prod.webservices.mozgcp.net/media/uploads/images/2025-06-17-01-06-37-c81e72.png

Unfortunately I can't change background color to blank or white in Tunderbird 139.0.2. In menu of reply window "Page colors and Background", "Use custom colors", "Background" I can set to #ffffff of course, click apply and ok, but that doesn't change it: https://assets-prod.sumo.prod.webservices.mozgcp.net/media/uploads/images/2025-06-17-01-06-42-eccbc8.png

I suppose it relies to the html formatting of the received email because on starting to write a complete new email it works. But that's very annoying that Thunderbird doesn't manage to change background colors on already formatted html body. Is this a bug or only poor source code and the programmer didn't have much motivation to write and robust code which could gather all html emails?

Could you check with this test email to test and reproduce? https://limewire.com/d/pqbEk#1idjNje6b2

Thanks a lot! I'd be very happy about your help.

I am struggling trying to get a consistent format in Thunderbird. First of all let me say that I am happy with the default use of paragraph style and if I want to have occasional single spacing I can use shift-enter instead of enter. Most queries on formatting seem to be about getting single spacing all the time. That is not my issue. That means that if I compose an email from scratch everything is just the way I want it, using the default settings. The problem arises when I reply to an email. The settings then seem to be ignored. For instance the line spacing can be fixed to single spacing whether I select paragraph or body text and no matter what I do I can't get it to follow the default behaviour. Also, I noticed that the font goes to "sans-serifArial" instead of the usual "Variable Width". In fact if I try to select "Variable Width" in the Format menu it is just ignored. How do I get the default composition settings when I reply to an incoming email?

With some of the messages I receive and with film sites such as Netflix and HBO Max, the screen becomes too large to access the control column on the right, a necessary manuever as the scroll arrow has suddenly lost its ability to scroll when that column is no longer seen. What do I need to do to rectify this?

How do I enable the display of the number of selected feeds? I have all toolbars enabled, but as I select feeds in the navigation panel, I don't see the changing number anywhere. The context menu of selected feeds only has the following items:

1. Options
2. Open in New Tab
3. Open in New Window
4. Delete
5. Move To >
6. Copy To >
7. Compact
8. Mark Folder as Read

Hi! I'm trying to set Thunderbird as the operating system default under Win 11. I tried to follow Mozilla's instructions: 1. Open the Settings application by pressing and releasing the Windows Start button, then clicking the gear icon. 2. Click the Apps icon, then click Default Apps in the list. 3. Click the icon under the heading Email to show your choices. 4. Select Thunderbird. The trouble is that at n. 3 there is no choice. There is only 'OutlookAccounts' and this item cannot be deleted or replaced. Can you help? All the best, Robifiori

When I launch the browser, can I not preload tabs that I have not used yet in this session, but which are open from the previous one? This is slowing down my weak PC. I did not find anything about this either on the Internet or in the reference book. Thanks in advance for your answer

Hello,

I am using the latest stable version of Thunderbird on Windows to read FTN (Fidonet) echo conferences that are relayed via NNTP (specifically, through Eternal September).

While the message bodies are usually readable, I have persistent issues with:

Unreadable or corrupted Subject headers

Author names displayed with wrong characters or encoding artifacts

Some headers showing as raw MIME encoding (e.g., =?KOI8-R?B?...) or complete gibberish

I suspect the issue is related to legacy Cyrillic encodings such as KOI8-R or CP866, which are still common in FTN systems. It seems Thunderbird does not properly decode these in NNTP headers.

I’ve attached a screenshot illustrating the problem.

My questions:

Is there any way to force Thunderbird to decode NNTP headers using a specific charset (like KOI8-R)?

Are there any config settings, hidden preferences (about:config), or recommended add-ons to fix this behavior?

Is there an open bug or known limitation related to non-UTF8 header decoding in NNTP messages?

I do not face this issue when reading standard UTF-8 NNTP groups or emails — only FTN-derived groups.

Thank you in advance for any advice. I’m happy to help with diagnostics or testing.

Best regards, Vladislav

Hello,

I blocked the pop-up windows from settings but it doesn’t work. Some websites keep spamming these windows and its annoying. Is that function limited? Is it just an option that doesn’t work?