Thunderbird Community Forum

This might also belong under accessibility. Or how to organize the screen? At this point I cannot get some messages because there is no space left for it. This has happened gradually but now its impossible. I will attach a screen shot to show the problem. (I would have a tiny bit more room if I could get rid of that line of tags since they come on a dropdown anyway. Thank you so much,

I copy/paste emails a lot for my job, which needs to include from, sent, to, cc, bcc, and subject:

From: Sender <sender@email.com>; Sent: Wednesday, January 21, 2026 at 11:27 AM EST To: John Doe <johndoe@email.com>; Cc: Jane Doe <janedoe@email.com>; Bcc: Subject: Email Subject

Currently, I am using the plugin ReplyWithHeader, which will produce this style of header on reply/forward, but is there a way to display this in the email body on view, without me having to reply/forward to produce the headers in the email body?

When I open an email that contains a thread, each response (or reply) shows up in its own window. This results in LOTS of email windows on the screen, and I have to fish around to find the one I want to see. Then I have to close all of them one at a time. How can I change this so the email thread is in one continuous window?

I am on 140.7.1esr (64-bit). My sub-folders under Inbox is not sorted alphabetically. I do not see any option to re-sort at the pop-up menu after I right-click at the account name. Does this mean the version I am on does not have this feature?

'Hey Ed .. need your advice again'

Open your TB profile:

- TB menu > Help > Troubleshooting Information

- click the Application Basics > Profile Folder 'Open Folder' button

- close TB and rename the folderCache.json file to folderCache.jsox

Restart TB and the list should be gone. Note this will also remove the list from the R. click > Copy To list.

======================================================

These are the 3 files in the profile folder. I'm confused ..which file do I rename? TB is closed This file folderCache.jsox .json - create date 01/13/2026 was created when I used above procedure on 1/13/2026...

I already have a folderCache.jsox file ... renaming it leads to file being unusable. '

folderCache.jsox - create date 12/21/2025

folderCache.jsox .json - create date 01/13/2026

folderCache.json - create date 02/02/2026

Thanks,Mike

I use a 32" monitor. In Thunderbird, I want to create some Message Filters. I bring up the Message Filter window and enter a filter. When I go to click the OK button to save the filter, I cannot see the button on the screen so I try to scroll the window via the scroll bars to find it but it won't scroll. I next try to shrink the window by using the CTRL key plus the mouse scroll wheel but nothing happens.

I cannot see any way to create and save Message Filters in Thunderbird unless the window can be reduced. Why does Thunderbird NOT use Windows facilities? I can generally shrink or expand a window by the Windows facility of CTRL + scroll wheel, but not so in Thunderbird.

I need some direction, please.

I'm having problems getting my signature to appear in Thunderbird as it does in my soon-to-be former email client. I've attached pics of the signature as it should appear and as it appears when imported to Thunderbird. I can edit the HTML code, but I'm not sure how to correct things like the image not importing when the link is correct and how to get rid of the dotted line border that shows up in Thunderbird when it does not appear in my current email client signature. I attempted to attach my HTML file, but cannot. I can post the code, if that would be beneficial. HELP!

I currently use imap with my email hosting provider and has worked well with Thunderbird. However, speeds are getting slower and storage costs have gone up. It is time for me to move non-current emails from my email account to back it up while still accessible. I was wondering if Thunderbird's Local Folders default path (C:\Users\......\AppData\Roaming\Thunderbird\Profiles\......\Mail\Local Folders) can be changed to a google drive folder on D:\ drive. If there are any risks in doing so. Thanks.

Hi Team My Thunderbird account has a font corruption. Whenever I open a new message, The font appears as a weird shadowy type - See image attached. The signature is saved image. I can't set a Tahoma or Verdana or any from the overall font list as the base font. However, when I send the email, the recipient sees a normal tahoma font. Help!

Cheers Ian A user for 20 years at least!

Hello! After like 20+ years I wanted to return to Thunderbird and right after the start i stumbled upon a massive showstopper... The need to exclude every single address "variation" of a website and/or email address is not only annoying, but will also make Thunderbird slower and slower with time.

Why does the exception list for remote content not support wildcards? Why do I have to separately allow content from e.g. "invitations@linkedin.com", "messages-noreply@linkedin.com" and "messaging-digest-noreply@linkedin.com", instead of just allowing all content from a domain "*linkedin.com"?

Regards, Black Seraph.

In the upper right hand corner there should be a minus sign, restore/down sign and an X. Instead of these I have what looks like an X in a box. It appears to be fixed when I run in Trouble mode. Even the default theme shows it wrong. This just began happening. Thanks to anyone who can help me out.

Hello,

I am using Thunderbird version 144.0.1 (build 20251016001905) on Windows 11 version 25H2. I want everything I use to be in dark mode, and I have managed to configure almost everything to work as I wish except for the Compose window.

I attach a capture of an email I received opened in the Compose window for reference. If I view this email in the 'Message pane', it displays as I want in its entirety : white text on a dark grey background, all the way down the reply chain.

However, if I click 'Reply' or 'Forward', the Compose window opens and the formatting of the message becomes skewed :

• The part where I write is fine, and takes into account my preferences as configured in the settings.
• However, the part where the previous message is included becomes a mess of formattings. Some parts are black text on my background colour, some parts are black text on a white background. It changed mid-lines sometimes. When the formatting is applied to a paragraph, I get a big white box that stretches accross the window.

I want the text to display as white text on a dark grey background. I also want the recipients to be able to open the mails I send in whatever formatting they want : my colleagues who use Outlook reported having skewed formatting from my emails (forced black background with varying text colour), which corrupted entire email chains afterwards.

I have tried the following : - In the 'Settings -> Composition' panel, I have tried all combinations of :

   - 'Use reader's default colors'
   - 'Use Paragraph format instead of Body Text by default'
   - All 4 'Sending formats'

- In the 'Add-ons Manager' panel :

   - All 3 default theme options : 'Dark', 'Light' and 'System theme - auto'.

- In the 'Advanced Preferences' :

   - Changing the 'editor.background_color' and 'editor.text_color' registers to what I want.
   - Changing the 'msgcompose.background_color' and 'msgcompose.text_color' to what I want (these seem to follow the 'Settings -> Composition' parameters anyway).

- Running Thunderbird in 'Troubleshooting mode' did not remove the issue.

I have included a screenshot of my 'Windows Settings -> Personalization -> Color' panel for reference. I have not touched these, as they affect the rest of my system and I do want the rest of my apps to keep behaving as they currently do.

I also find interesting that before 'upgrading' to Windows 11, I also used Thunderbird and had no such issue whatsoever. Unfortunately I do not have access to my previous Thunderbird configuration and information, as I installed Windows 11 from scratch instead of using the 'upgrade' process.

Since the 'Message pane' displays as I want, I assume it is possible to do what I want. I even tried to send myself the email with the skewed formatting, to check if it displayed correctly in the 'Message pane', and it did. However, I am at a loss for which parameters I need to check / uncheck for it to work. Please help !

Thanks, best regards, Aurelien

I have Thunderbird 145.xx and I HATE message threading (conversation view). I have set 'mailnews.default_view_flags' = 0 but it is not stopping new mail from coming in and being displayed in conversation view. (UGH!!!!)

Is there a way to permanently disable this annoying feature?

I've looked at various other forums and chats, and it looks like this isn't possible...but is there a way to have T'bird expand all email threads by default for all folders, so I don't keep on having to hit the "*" to make it happen? This seems like an easy fix, whereby the user could have threads collapsed or expanded by default.

Every time a new email comes into my machine a little square pops up on the lower right hand corner of my screen and makes an annoying noise as it gives me the name of the sender of the email. I do not want these notices and I did not have them on my previous computer. How do I get rid of them?

I just installed Thunderbird on an up to date Windows 11 PC and unchecked the box Automatically mark messages as read, but it keeps marking all of my messages as read.

Help please!