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My windows 10 machine died on me recently, but I was able to recover all my Thunderbird Email files from the old hard drive. However, the Thunderbird settings I was using under Windows 10 did not transfer over to the new machine and there is one particular issue which is driving me crazy and I don't know how to fix:

Basically, on my previous machine I frequently filtered my emails using the threaded option based on the Subject field. However, under Windows 10 the filter I was using would ignore the "Re:" in the subject line of such threads and so every message in the thread was displayed as if the various instances of "Re:" simply weren't there. However, on my new machine Thunderbird threads messages as if each instance of "Re:" represents a new thread! How do I fix this?

I've been using Thunderbird for about two months now and I just realized that Thunderbird (150.0.1) seems to be unable (or unwilling) to use some of the fonts that are on the computer (Windows 10, plenty of RAM and disk space).

Let me explain that I don't send a lot of emails, and most of the ones I do send are just a few lines so I had not had any reason to bother with the font -- the default font was fine -- until today...

Today my experience with fonts in Thunderbird was extremely disappointing. It started when I was composing an email and I copied/pasted some text from a web page into the email. Rather than treating the pasted text as simply text to have in the default font, Thunderbird put it in some strange font and size. This might have been Thunderbird's attempt to use the font from the website but neither the font nor the size resembled the text that I had copied/pasted. That was when I noticed that Thunderbird does not let you choose the actual size but only offers the choice to make text larger or smaller. Making the text smaller was sufficient for that particular time.

As I finished the email, I tried to sign my usual signature. Thunderbird lets you choose the font but once I had chosen the font that I routinely use for my signature, I discovered that Thunderbird totally ignores the choice that it just let you make. Instead of displaying the signature in the chosen font, it displayed my signature in a plain sanserif font.

I could live with a limited choice of fonts -- I have used another program where the only choices were serif and sanserif -- but I cannot understand why Thunderbird would offer a font choice menu that includes all my installed fonts when it actually only honors three choices. The only fonts reliably used seem to be some generic sanserif font that Tunderbird calls Helvetica/Ariel, a generic serif font that it calls Times and another serif font it calls Courier.

The dropdown menu lets me choose any of the fonts I have installed, some of them display properly while composing the email, others don't. If I send the email to another of my email addresses, Thunderbird displays the text the same way -- some fonts are correct and some fonts get replaced with one of Thunderbird's generic fonts.

I'd really like to have all my fonts available -- but that doesn't seem to be possible with Thunderbird so I guess I need to figure out which fonts Thunderbird is willing to use.

1. There is not a relevant "topic" above for this question 2. How can I print a 1 page email on 1 piece of paper? View headers are set to Normal. I get one page with From, To, Reply to, & Subject then body on next page. I used to just select Print and my emails printed normally. I have been using Thunderbird for more than 20 years with out this problem

Hi

I'm using Thunderbird 140.5 on a desktop Mac running Sequoia 15.7.2

In Local Folders, my subfolders have subfolders. In both levels of subfolders, Thunderbird has spontaneously started disordering both newly created subfolders, and folders which I move from one subfolder to another using right click 'Move To'

Up until ten days ago, all folders whether new or moved, were listed alphabetically. Now, day by day, the disordering is getting worse and as someone with ongoing conversations with hundreds of clients, it is becoming impossible to work when I have to give so much time to slowly scanning through every folder looking for the relevant subfolder.

I don't know why I can't update this version, but I tried installing the newest version available (145) and used the 'reset folder option' which did not work either.

Also, setting up a whole new account instead of upgrading my existing account is a colossal faff and I'd rather not have to!

Aside from manually reordering (also a colossal faff), can anyone suggest something I might be missing in stopping this happening?

Thunderbird says I'm on an esr channel, if that helps

Thanks

The spacing of the Subject column label is inconsistent and apparently not under the control of a user. In the graphic with yellow notations, the leading space for Subject is much larger than any of the other column labels shown.

Also, in the graphic with red notations, the leading space for Subject is even larger; I "applied columns to ... Folder ..." yet both folders are not the same as the leading blank space for the Subject column header is different from the "copy from" folder.

I cannot find anywhere that this is controllable by the user. Please advise on both issues: too much space on the Subject column before the word Subject and the inconsistency of the Apply Columns To feature.

Thank you.

Hi

When Thunderbird is started maximized it overlap taskbar if is set to hide and taskbar won't show until Thunderbird is minimized and maximized. Another way is to press the Win key two times. Then the hided taskbar can be shown/use. The same thing happens to Firefox. Only when is first started. Then if Firefox is minimized and maximized, press Win key two times, press F11 two times then the hided taskbar show/hide normal.

It is a setting that can be changed to start Thunderbird and Firefox in full screen and do not overlap hided taskbar?

My inbox is now put in alphabetic order thanks to one of the newest updates. I want it at the TOP. Can you fix this? In Thunderbird I now have to manually drag it to the top each morning.

When I open email in outlook my Inbox still appears at the top where it should be.

I hope this can be fixed sooner than later.

If this isn't the right place to post this please provide an email to post to. The website is not user friendly enough to be of any help to me.

I have multiple email adresses for different purposes, but all of the incoming emails are sent to the Local Folders inbox, where I have separate folders to save emails for the each purpose. I am able to manually sort the folders in the order that I prefer, however each time I shut down Thunderbird and then restart it, the folders end up in seemingly different random order each time. Is there a way to ensure the manually sorted order of the folders does not change?

When uploading files with Firefox, I click the upload button, and the file browser window appears to upload files.

For as long as I can remember, it always defaulted to the last folder location that I uploaded a file, but just a few days ago, it stopped working, and always defaults to my home folder.

How can I make the upload window pop up, default to the last uploaded location? My OS is Linux Mint Cinnamon.

When clicking any hot link in an email, whether FB or a web retailer email, etc. this message pops up: "This file does not have an app associated with it for performing this action. Please install an app, or if one is already installed, create and association in the Default App Settings page."

At a loss for a solution here. Can someone please help. Thanks.

When I press F12 to use the developer tools and try to change the width of the panes by click and drag the divider there now seems to be a limit to the panes width that was not there before. I'm not sure with what version I stated to notice this. I use to be able to drag the right hand panel fairly far over to the left and could take up about 75-80% of the width of the developers window. Now I'm guessing that I'm able to drag the right panel to a max width of 35-40% for some reason. I have not changed anything in the about:config page. I'm not sure why I can't drag the right panel to cover the 75-80% of the window that I had been able to do.

Is there a setting in the developer tools or on the about:config page that sets the max width that the right hand panel can be dragged to the left?

I have an IMAP account with three folders in it that I need to keep below quota. They are Inbox, Sent, and Deleted. Among my local folders I have Archive of Inbox, Archive of Sent, and Archive of Deleted. I have three message filters that move old messages from the IMAP folders to their corresponding local folders. I understand that these filters have to be run manually, not automatically, because their source folders need to be set before each run. None of the filters is enabled, I'm not sure what this setting does but I think it prevents Thunderbird running the filter automatically. Each of the filters has Manually Run checked and all other options left unchecked. The retention policy for each IMAP folder is 'Use my account settings'. The relevant account setting is 'Don’t delete any messages'. I would therefore expect messages to remain in my IMAP folders until I run the filters, but that does not seem to be what is happening. I delete several messages per day and they go from the inbox into the deleted folder, but the total number of messages in that folder doesn't increase - in fact it sometimes decreases whilst I'm working. It is as though a ghost is running the filters when I'm not watching. Can anybody tell me what is happening?

Hello,

I am dealing with a quite frustrating issue, and I literally cannot do anything to stop it from ruining my messages.

Whenever I manually type in WhatsApp Web or AI chats (like ChatGPT or Claude), Firefox completely hijacks my text box. As soon as I start a line by typing "1", a period, and a single space ("1. "), the browser forces my text into an auto-formatted numbered list.

This isn't just unhelpful; I see it as a genuinely harmful feature. The formatting it forces on me is weird and broken—it frequently adds massive, irrelevant paragraph gaps between list items, completely messing everything up.

I am completely stuck because standard fixes do not work:

If I press Ctrl + Z to undo the auto-formatting, it also deletes the space I typed.

I am not pasting anything; this happens the millisecond I type the spacebar from scratch.

It feels awful to have my manual typing hijacked like this. Users should be able to type a simple number and a period without the browser transforming it into a broken HTML list.

Is there an about:config setting or any way to completely disable this auto-formatting feature so I can just type normally again?

Thank you.

Hi community,

I want to have the same font and font-size in:

• my HTML message body text
• my signature.html file

so I can send consistent and nice-looking e-mails, like you would expect.

Here are my current settings:

• Settings > General > Language & Fonts > Fonts >
  • Default font: Arial
  • Size: 12
  • Advanced: For both "Latin" and "Other Writing Systems" I have the settings you can see in the attached screenshots.

I heard that these settings are for personal viewing.

• Settings > Composition > HTML Style >
  • Font: Arial
  • Size: Medium

I heard that these settings are for viewing by recipients.

The first line of my signature.html file looks like this: div style="font-family: 'Arial'; color: #222; line-height: 1.0; font-size: 14px;"

There is always a slight font size mismatch of the message text with my signature.

I unsuccesfully tried tweaking the html font size values in px or pt to match the given size in Settings > Composition > HTML Style for Medium or Large.

It seems that the available font size granularity of Medium or Large just does not match corresponding pixel or point values?

I would be extremely grateful if someone can guide me on how to achieve this!

If there is no valid solution for this problem, I'm happy to open/report an issue on this.

Thank you and have a wonderful day