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In TB prior to v.155, folder message counts were not shown at all if the respective folders were empty. That is, instead of showing "0", TB did not show anything.

Now, after updating to TB v.155.0.1, I see dashes (horizontal lines) in the folder tree to the right of each empty folder.

Is it possible to revert back to the original behaviour and get rid of those unsightly dashes? They only add visual clutter (my opinion, obviously) while not providing any extra information.

Thanks.

I have no idea what happened to my Thunderbird. I think it might have been an update, because all of my folders are not where they were, everything in the folders are sorted by groups like today, or older. I noticed a bunch of my emails are now in folders marked as a Userfolder#. The emails it contains are those that normally should be in a properly named folder, only those named folders are grayed out. Another issue is that when i try to open an email, it opens it as if I want to reply to it. If I just want to read the email, I have to right click on the email and select open to read it. I have 2 spam folders, no idea why, nothing saves to my draft folder I found out today, I just dont know what happened! I dont think I did anything but I dont know now, as Im beginning to doubt myself. It's been this way for a few days.

When links appear in a message, a mouseover used to display its URL at the bottom of the window. It has stopped doing so. It was a real help in catching scams. How do I get it back? Help / About shows "Thunderbird is up to date."

I have "Open previous windows and tabs" and "Open Firefox automatically when your computer starts up" boxes checked in my settings.

Firefox is not opening automatically and my previous tabs are not showing up.

Thanks

I have Thunderbird 153.2.0esr which runs 2 Email filter (on Inbox and on Outbox)

These filters worked for years.

Suddenly, about at the end of July 2026, the stopped working.

I suspect that one of the latest release of Thunderbird make them stop working.

Is it possible? Any suggest?

Also the filter log registry is empty.

On September 5, Thunderbird updated to 155.0 (20260828141248) (on Windows 11 10.0.26200). I use IMAP.

Since then, when I try to delete a message, I get an error: The current operation on ‘Inbox’ did not succeed. The mail server for account <email address> responded [TRYCREATE] Mailbox doesn’t exist: INBOX/Trash (0.001 + 0.000 secs)

But in Settings, "When I delete a message: Move it to this folder: Trash" is set. Not Inbox/Trash or INBOX.Trash, which also exist, but Trash at the same level as Inbox. I logged into webmail for this account, and there's definitely a folder for Trash. All deleted messages prior to the update are still there. If I delete a message in web mail, it is moved to the Trash folder.

The same is true of the Sent folder. In Settings, "When sending messages, automatically: Place a copy in: "Sent" Folder on: <account name>."

It looks to me like Thunderbird is doing something different from what the Settings say, and definitely something different than what it did before the update.

Suggestions?

I'm aware (e.g. https://support.mozilla.org/questions/1277401) of how to toggle whether the message window stays open (opening the next message) when an email is moved or deleted. But I would dearly love for it to happen only sometimes.

Specifically, when a new message comes in, I want to read it, usually move or delete it, then read the next new message, if there is one. But if the next message is an old one, I don't want to keep having it shown to me. I keep my inbox fairly tidy, but I'm getting sick of seeing that message from a year ago that doesn't have a better place to be.

So, after moving or deleting a message, if there is an adjacent unread message, keep the window open. Otherwise, close it.

If there's an unread message somewhere else in the folder, don't jump to that one. Trust that I've left it unread for a good reason, and don't want to now constantly get shown it, and also have to remember to mark is as unread again.

If it's easier to look for other unread emails based on dates, a few days (enough to span a long weekend, for example) would probably be enough, a week at the most. Or make that number user-configurable.

I used to be able to set message filters to play a sound of my choosing after a message was filtered into a folder (a chime so i know when mail from a client arrives). For a while it was not an option, so I used various extensions that eventually were no longer supported (ToneQuilla, Mailbox Alert, FiltaQuilla, Soundmail). I suspect that the last one may have corrupted my Thunderbird and caused my recent issues, so I removed it (and now I have no extensions installed). Sound Mail is the only extension I can find that plays a sound for filtered mail only.

Meanwhile, the "Play Sound" option has appeared again in v155.0.1, but with no choice of sound file, and nothing plays. It's not a sound issue; other sounds play in other programs, and the normal new mail sound plays when I enable it (but I don't want sound notifications for all mail, just client mail).

Any solutions?

Hi, in the vpn buil't in, it's not possible to change location (on Firefox android) however in the help that's indicated it should be, did I miss something ? thank you

This just started today. I am seeing question marks between the sentences in my messages. I had this issue a number of years ago and do not remember the fix. I am running the latest version on my Windows 7 desktop. It is just the new messages not the older ones in file.

Anyone remember the fix?

Thanks

Al