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Whenever I open a message from the inbox into its own window, the message text and images are tiny and unreadable until I zoom (Shift-Cmd-+) them larger. And when I reply to a message, the text is also starts out tiny, but gets larger when I Zoom it up with the original message. Similarly, the column-header icons of the inbox are tiny, while the text is OK.

All the rest of the interface is normal and readable, except for the tiny text and buttons in the interface-command/confirmation boxes.

I have experimented with the suggestions in these question-replies, but to no avail:

https://support.mozilla.org/en-US/questions/1474665

https://support.mozilla.org/en-US/questions/1480963

I can adjust the font size and density from the "hamburger menu", just fine. And the MacOS 15.3.n-on-Intel settings seem right.

What am I missing? What else is there to change?

Thanks in advance... Alexander, long-time T'bird user

Am I the only one that finds it almost impossible to change fonts. I can change what I type to Large. But that's all. I can't change anything I Cntrl-V into a message. Or inherit text in the process of a reply.

Oh, woe is me. I had both Thunderbird and Firefox open on my desktop, and thought I was typing into Firefox's address bar. But Thunderbird was actually 'live' (selected?) on the desktop, so that's where my keystrokes went. Not sure what I typed or where the cursor was, but suddenly I have two folders in the left Thunderbird pane that I can't figure out how to get rid of. They are both just above my Local Folders: Templates and Archives folders for one email account, and an Archives for another. All three folders are empty (Archives had "2025" subfolders, but I was able to delete those). Keyboard strokes generated these, but they don't delete. What can I do? Can I navigate with Windows Explorer to where these folders actually reside and delete them there? I sure don't want to mess anything up. Many thanks in advance!

Running Thunderbird 136.0 (current as of 14 March 2025) on Windows 11 machine. E-mail account is hosted on office365 and has a personal (i.e., myname@mydomain.com) SMTP error " Connection to server outlook.office365.com timed out" Parameters were set per recent article on thunderbird forum for office365.

My page throws errors in Firefox Nightly such as

Expected color but found ‘undefined’. Error in parsing value for ‘background-color’. Declaration dropped. preview.htm:1:1

and

Expected color but found ‘undefined’. Error in parsing value for ‘color’. Declaration dropped. preview.htm:1:1

The page references ten CSS files besides having dozens of its own CSS declarations. The issue is tha the reference provided to the error (:1:1) does not indicate where I can find the error. That is, I don't know which declaration is at fault. Is there some straighforward way to find the declaration in question?

I haven't upgraded browser versions for a while and I'm now going from 109 to 132. Pretty bad I know.

I'm having a number of issues but for this post I'd like to concentrate on userChrome.css.

In version 109, I had a custom font for the top menu bar, the top menus, the bookmark toolbar, the bookmark toolbar menus, and the right click menus. I did this by including the following in userChrome.css (as per [https://support.mozilla.org/si/questi.../1335097|here]:

1. navigator-toolbox { font-family:"MyFont" !important }

This worked great, but it is no longer working in version 132. Obviously I don't know in which Firefox version this stopped working.

Has this been disabled by Mozilla or has it been changed? If it's been changed, how can I achieve it now?

I'm very grateful for any help!

Using Tbird 78.14.0 (64 bit) with Windows 10. I can no longer access the Page Setup screen properly. I suspect it's because I accidentally put a very big value in for the top margin. The print preview for even a short email says it's many pages, there's no text visible on any of those pages, the only part of the Page Setup screen visible is OK and Cancel at the bottom, and I can't get to the top of the screen. I've tried closing and re-opening Tbird to no avail. How can I get to the top of the Page Setup screen to fix the problem?

Hey, I'll try to keep this brief. Microsoft is forcing me to buy a new PC so as to "upgrade" from Windows 10 to Windows 11. My Windows 10 PC has Thunderbird (128.9.1--it says it's up to date) and it works just fine. I've spent over two hours attempting to set up Thunderbird on my new Windows 11 PC and...no dice. I'm at the end of my tether; I can't afford to waste more time on this. So...

--Thunderbird 137.0.1 (fresh download this afternoon--unclear as to the discrepancy vs. Windows 10 ver.) --Email = ATT --The setup program says it knows who ATT is and has the configuration --When I press "Done" for the setup to get everything going, it spins forever, then says, unhelpfully, "Unable to login at server. Probably wrong configuration, username, or password." --Needless to say, I've checked everything 48 ways from Sunday; let's assume that my email is correct --So if it's not my email address, that leaves password or configuration, right? --Password: According to Mr. Google's AI (*ahem*) I shouldn't use my regular password, I should use a "secure mail key"...well, that's okay, my regular password wasn't working anyway --Believe it or not, I've got notes on my original secure mail key so I enter that. Doesn't work. I enter the random character string that the secure mail key is supposed to stand for. Doesn't work. --I generate a fresh secure mail key in case the silly things have a shelf life. The new one doesn't work, nor does its random character string. --I then direct my attention to the configuration. Thunderbird said it knew what to do, but...what if? Inbound looks okay, compared to the settings on my old PC and also as recommended by Mr. Google. --Outbound...uh, oh...

Folks, I've tried every permutation that I can think of for passwords and outgoing servers and, lacking any intelligent guidance as to exactly what the problem is, I have no idea what else to try.

I'd appreciate advice as to what to try next, but am no longer hopeful. I may have to move on to another program in an effort to get something that works. I'm falling behind on my day.

Spoiler alert: Don't tell me to curse at the screen or give it the middle finger...I've already tried those approaches and they don't work.

Thanks, Grey

One of the things I heavily rely on with FireFox is it storing words I type in reply boxes on various forums. Lately however, Firefox only seems to keep them for several hours, then they disappear. For example, I can type in "K Frame." (See image attached) The next time I go to use that field again, that text will automatically appear. And it may continue to do so for several hours, even if I close out Firefox and return later, but eventually, within 24 hours, it will disappear and I will have to retype it again the nest time I want to use that phrase. FireFox used to hold these words or phrases forever.

Any suggestions????? Both my Windows 11 and Firefox are up to date.

Before the last update, when you assigned a colored label to the message (e.g., work, important, etc.), the entire title, header of the message, took the chosen color. Now you only see a small tag.

'The previous system was definitely more practical. Can it be reactivated?

I don't like threaded conversations view. I turned it off so my inbox doesn't show it any more, but search results do and I find it impossible to find what I need. Is it possible to turn off ALL of those threading features across the entire program? Thanks

Hi, I download some e-mails. After checking the emails, I want all of them to be deleted from thunderbird but... ...I want only specified emails deleted from server.

In Mac's "Mail" program, there was a special window, where I could see all e-mails on server and just select which I want to remove from server.

In old Outlook, I've used "Rules". There I could set the parameters for specified e-mails and then tell outlook to "leave that message on server" or "Don't download that message from server".

How to do it in Thunderbird?

I moving from classic outlook to Thunderbird and I am having trouble finding how to change fonts and color in signatures for my emails. I do not do html it is a simple signature; name company name and phone numbers. I search and found no help. Is there a way to change color and font in the reply to an email? Sorry I know this sounds simple but I have been using outlook since it came out so this is similar but just enough to give me trouble. Thank you for any help, rick

Information Your browser is being managed by your organization. how do i stop this why am i getting this i went to regedit and it stopped it an it continues to come back Information Your browser is being managed by your organization.

Yet another sterling example of why change is usually bad. Why did Firefox, Google and other browsers (though don't know about Duck Duck Go) drop the 100 results per page option? I've always had that enabled and now that it was removed it makes searching extremely tedious and time wasting. Please offer a SIMPLE AND QUICK way to restore this option ASAP. Thank you.

Hallo und guten Tag,

ich habe für Windows [PC] und Android [Pixel 8pro] jeweils die beiden aktuellsten Versionen von 'Thunderbird x64'und 'Thunderbird: Free Your Inbox' installiert und eingerichtet. Es sind zwei E-Mail-Konten mit jeweils einer Alias-Adresse eingerichtet, alles unter GMX.NET , IMAP+SMTP sind ebenfalls aktiviert [IMAP port993 und SMTP port465]. Leider bekomme ich es nicht so eingerichtet, daß Mails wenn sie am PC oder am Pixel empfangen und verschoben oder gelöscht oder als Spam markiert sind, daß dieses dann auch am jeweils anderen Endgerät so erscheint. Es werden immer wieder alle Mails neu als eingegangene Nachrichten gezeigt und ich muß dann am jeweils anderen Endgerät die gleichen Aktionen vornehmen.

Wo liegt der Fehler, was muß ich tun um das Problem zu beheben.

I am running TB 138 and still have some issues with the layout and UI. How can I customize the spacing and font size for the "From", "To", "CC" and "Subject" fields? I much prefer the old TB interface where all these fields were much closer in terms of spacing, and the subject line font was same the size as the rest, in bold. Any way to customize this?

Thanks in advance.

Using Thunderbird 128.5.0esr (64-bit) on 128.5.0esr (64-bit). In calendar view, I see all my appointments with the background colour of the calendar they are in (see attached). In my inbox view, I have the Events tab open at the right. All day events have the background colour of the appropriate calendar, but ones with timings have a dot. (see attached). How do I make ALL calendar events have the background colour of the associated calendar in the mail events tab??

Hi!

When i upload one of my photos the dark bakgrund looks awful (see attached photo)

Edge diaplys it fine but i am a firefox user and have allways bean.

Please help!

Since an update 4-5 days ago, Comcast SMTP server does not accept login from Thunderbird. Comcast help page said it was updating and requires a more secure SSL security. Today the Pop3 server does not allow signin either.

How can I select a more secure encryption that will be compatible with comcast.

Thank you.