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I use Thunderbird for email and Edge for my browser. Unfortunately the icons for the two are so similar it's difficult to tell them apart. I'd like to suggest that Thunderbird/Mozilla allow users to substitute their own icons for the running programs if they don't want to use the default one.

Hi,

I'm using thunderbird for over twenty years, and for ages I have been using a customizable list view where I could limit the list view of messages in a mail folder based on rules, eg. message tag, age in days, sender, has attachment, things like that, and had a lot of rules to limit the view of messages.

Now I am on a trip, away from home, with a freshly installed Ubuntu 25.04 and latest thunderbird, 128.10.0esr-1, and I can't find how to enable the selection menu to limit the view to tags or customized rules.

The quick filter bar seems to be somewhat redesigned, and it seems to have lost the option to add this menu to the quick filter bar.

Where have these customizable views gone to? I can't find them anymore, although I am sure I do have these working on my machines at home.

(And no, don't propose to use saved searches, they are not a substitute for that.)

I'm trying to create an event that start from time in PST, and end in China Standard Time. However, the date time selector doesn't seems to be aware with the timezone I selected and still prompt that I selecting wrong time.

I'm on the latest stable Thunderbird release, 138

I have a downloaded application of Thunderbird 78.6.1 on my computer from 2021. With my new Windows 11 Pro I had to download and install 138.0 (64 bit) and I'd like to go back to 78.6.1. Can I install it by running the application from the old download? If so, do I need to uninstall 138.0 first?. Will my address book and emails be safe? Is there any profile mix up I should be concerned about?

Hello,

The latest version, 128.10.0esr, was recently released, and one of the changes is:

Changed color override defaults with high contrast mode on macOS and Linux

https://www.thunderbird.net/en-US/thunderbird/128.10.0esr/releasenotes/?uri=/thunderbird/releasenotes/&locale=en-US&version=128.10.0&channel=esr&os=Darwin&buildid=20250425031534

I use dark mode, but I prefer to view the email body in light mode, as this is typically the sender’s default formatting. To achieve this, I previously configured: • Settings → General → Fonts & Colors → Colors • Set Text to black and Background to white • Enabled “Override the colors specified by the content with my selections above:” and set it to “Only with High Contrast themes”

However, since this update, this setting no longer works. Now, the only workaround is to manually click the “Turn dark mode off” button for each email, which does work. But it’s inconvenient to do this every time.

Is there a way to disable dark mode for all email bodies by default, so I don’t need to click the button each time?

Thank you!

Yours,

My user upgraded Thunderbird to v136 and no longer can sync his calendar on our IMAP server (Cyrus). When Thunderbird attempts to log into the calendar Cyrus logs an "Internal Server Error" with the detail

May 5 15:11:39 XXXXX cyrus/https[198300]: badlogin: [10.8.0.10] Basic SASL(-1): generic failure: All-whitespace username. May 5 15:11:39 XXXXX cyrus/https[198300]: [10.8.0.10] with "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:138.0) Gecko/20100101 Thunderbird/138.0" via SESSIONID=<cyrus-1746483098-198300-1-4996003587903488780>; "PUT /dav/calendars/user/XXXXX/Default/040000008200E00074C5B7101A82E00800000000E0076891A1BDDB0100000000000000001000000076BAF045101B7D4EA90CA085DF4D7B11.ics HTTP/2" (if-none-match=*) => "HTTP/2 500 Internal Server Error" (stream-id=3; error=The server encountered an internal error.) [timing: cmd=0.000448 net=0.000035 total=0.000483]

The user can access their email so their account username/password is stored correctly in Thunderbird, it's just not making it to the calendar subsystem.

Failure is 100%. The user can access their calendar from the previous version of Thunderbird and by using another app on their phone.

Hi, I've successfully downloaded and installed Firefox on my HP laptop with Windows 10 and now attempting to download and install the Thunderbird email client. On Thunderbird.net when I click the Download button, the Donation Page pops up (and I made a donation) then closed that window. I'm then on the Thank You page but there is no prompt to install, so just stuck on the Thank You page. Thunderbird is not appearing in my downloads file. Can you please help?

1. Thunderbird was not my default mail client in Windows. When I tried to select it as default it did not appear in Windows' list of applications.

2. I tried to find the my profile and it showed where it was - but that directory did not exist. I finally was able to make a new profile and the directory showed up - but then the default-esr profile disappeared and now I can't find it and neither can Thunderbird. Is there a way to find where it went? I don't believe I delete it, it just went away. This is the message I get:

Your Thunderbird profile cannot be loaded. It may be missing or inaccessible

I had set my Ubuntu 22.04 browser to Chromium for a while, but decided that all my cookies are in Firefox so I chose to switch back. Full reset after power-off, of course.

My Environment Variable $BROWSER is now set to Firefox, but Thunderbird apparently has a mind of its own. ;-) It still opens or switches to Chromium with every web link executed.

I've explored the ~/.thunderbird/ directory but see nothing there.

What am I missing that I need to be educated about?

Thanks in advance!

 -- Don Wilde

Looking for a way to let two Windows 10 user accounts access the same Thunderbird account/files.

We have a desktop PC used by two people, 'C' and 'S'. They each have a Windows user account, but share an a general email address (don't ask...)

The Thunderbird installation has at least 32GB worth of mail, going back several years, which I'd prefer not to duplicate on the hard drive. Additionally, mail is only stored on the server for 2 weeks, before being deleted. The Thunderbird installation is accessed from user account 'C'. The computer will, for practical reasons, only be used by one person at a time, but they will both be logged in most of the time, and would likely both have Thunderbird running at the same time.

Is there a way to direct Thunderbird, opened from user account 'S', to the files used by 'C'?

Thanks!

Hello everybody I'm using Thunderbird version 115.10.1 (64-Bit) German. This question appeared some years ago. Now I'm still confronted with the same question. When I reply to messages or I'm up to forward a message, my signature is not inserted. I used TB for a very long time and I used this feature in the past extensively. I think, this must be an issue to TB .

Have always set up accounts so they download all messages to hard drive.

Since 3/27/25, it is as if it never officially logs the downloads as downloaded, so it downloads each day as if it hasn't been done since 3/27/25, marking all of the messages since then as new.

File is very large so want to try fixing without deleting entire file.

Tried the 'repair this folder' but that didn't work.

Having trouble identifying the exact folder on the hard drive to delete since there are several different accounts in the Thunderbird setup.

I was browsing this page: https://support.mozilla.org/en-US/kb/adding-a-holiday-calendar

Which says:

• Select "On the Network", and click "Next".
• From the Format list, select iCalendar (ICS).

But when I select "On the Network" I see no options for file format (TB 138).

Is subscribing to remote ics files still supported, or must we download the files locally and subscribe to them there?

I rebooted my Windows 11 PC yesterday and apparently Thunderbird updated to version Thunderbird 128.6.1esr (64-bit) during the reboot. Unfortunately, when I opened Thunderbird, it showed a Create New Account screen instead of my existing email accounts. I went to "about:profile" and it lists my existing profile as the default, but it will not access any of the accounts in it. I've tried reinstalling Thunderbird over the existing copy and get the same result. I'm at a loss as to how I can retrieve many, many years of emails in six accounts!

Here is an image explaining the issue I've been suffering from the last two days. Before everything was fine :-(

Any search gives me "strange" results. The worst is when there are at least 25 emails in the folders and no one is found, and the list is empty... ... or if it finds some while the others are lost in the void and you're not aware of that??

Already, I've Rebuilt the index twice... no satisfaction.

I need that feature to work perfectly, otherwise I'm lost !!!!!

( Local folder is populated by at least 25 root folders + a lot of subfolders with many sub-sub-folders )

PS: 2° pic "Agrip" should give a result > I was searching "agrip"'s mails not yet moved in that Sub-Sub-folder

I am running TB 128.5.2esr on a new Macbook pro. I've recently been forced off POP into IMAP using OAUTH by google which now requires IMAP only with Google workspace emails. I have a somewhat detailed folder structure for all my incoming mail that benefits from TB filters.

At first I tried reconstructing this folder structure on the IMAP server, but it was a nightmare and did not work correctly.

I have finally found a solution where I filter all incoming email onto a local folder set. However am now finding that the bodies of the filtered emails are coming blank 50% of the time - most likely because the filter is executing faster than the IMAP will load the whole message.

Is there a way to delay the filter execution on the IMAP inbox so that when the filter executes it will copy the message headers AND the body reliably?

In case someone is wondering: this is not a network or connection issue. I am running on hardwired connection on fiber network, and the messages that make it or don't make it are randomly sized (small ones fail while big ones don't and vice versa).

Setting aside the POP vs. IMAP discussions, I will say that I miss POP because it allowed me to "catch" all my email in the gmail server, while using it as I saw fit on my TB/local computer. Now I'm required to mirror both - which is not helpful to me.

Thank you for any help.

Pressing Get Mail icon displays some 8 messages in bottom ((.)) line of Thunderbird including <provider URL>:Connected to <account email address> and finally Checking mail server capabilities. Up to 4/1/2025 that got all the new emails of the account but since then no emails get into Thunderbird in any of the account's folders.

I've received a couple of emails where in the email list they have text/plain et al where the sender's email address would normally be, and in the email window it says text/plain, charset=UTF-8. Can Thunderbird not handle UTF-8 in emails, or is it just in that part of the email?

I have replaced Windows 10 on my laptop with Linux Mint 22 Cinnamon. I installed Thunderbird and, with a little diificulty with passwords, have my gmail accounts working. However I have a freenetname email address which appears to be installed. However when I seek to use it I am asked for a password. I enter the password that I use on my desktop for the same account but it is not recognised. I looked at the saved passwords (on my laptop) in Settings. None are displayed for the freenetname account and I can't see how to install passwords here to, perhaps, solve the problem. Some help would be very welcome. Thank you