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Hi all — I’m running into a persistent threading issue in Thunderbird (v.148) vthat survives profile rebuilds and affects only specific conversations.

Symptoms Some threads show the expand/collapse carrot normally.

Other threads (same accounts, same folders, same time period) do not show the carrot.

The pattern is consistent: the same conversations fail before and after a full profile rebuild.

Both Inbox and Sent show a mix of threaded and unthreaded conversations.

No global setting seems to be wrong, because most threads work correctly.

What I’ve already checked mail.strict_threading = false

mail.thread_without_re = true

View → Sort By → Threaded

View → Threads → All

Folder Repair on Inbox and Sent

Full profile rebuild

Re‑added all accounts

Rebuilt .msf files

Verified that threading works across folders (Inbox ↔ Sent)

Verified that threading works across accounts

Verified that threading works for most conversations

Header checks For the conversations that do thread, headers look normal.

For the conversations that don’t thread, the headers also appear normal:

Message-ID: present

In-Reply-To: present

References: present

No obvious corruption, malformed IDs, or missing brackets.

What I’m trying to understand Why would Thunderbird:

Successfully thread most conversations

Fail to thread specific conversations

Preserve the same failures before and after a rebuild

Show carrots in Inbox but not in Sent for the same conversation

Show no global misconfiguration

Is there a known edge case where Thunderbird rejects a thread even when the headers appear correct?

Are there hidden rules about ambiguous References: chains, multi‑server storage, or cross‑account BCC workflows that could cause this?

Any insight into how Thunderbird decides not to show a carrot would be appreciated.

Thanks in advance.

FF is offering up possible login names for a particular site I have used previously even though I have removed all related browsing history, form data, and cookies (and cleared the cache). What am I missing? Is it using stored history for unrelated sites to guess at a user name, or is there some other hidden history I need to clear?

Not sure if "browse" is the correct topic but here we go:

After a random crash (I don't remember the details, been a while) I've "refreshed" Firefox. Following that I started to have some problems with Google Meet. Haven't had any for years and suddenly when i open Google Meet (working from home and using Google Meet as an online meeting platform daily), everything becomes unresponsive. I can't change tab, cannot close Firefox from the close button, nothing. I open the Windows Task Manager and End Task manually to close the window so I can restart the browser. After restarting Firefox and launch Google Meet, it doesn't crash.

The other problem is when I try to watch something on Netflix, I hear the sound, see the subtitles but the video content is not present. It's just black screen with UI on it. Yes, I checked the DRM setting and no, other streaming services that I use don't have this problem. I can bypass this by launching Firefox in troubleshoot mode but I want to use my extensions. I even tried to enable them one-by-one to see if anyone causing problems but even when I disable all of my extensions like in the troubleshoot mode I'm still having the same problem.

I tried several solutions that I found on reddit etc. but nothing worked so far. I also re-installed Firefox and nothing changed.

Please help me before I lose my mind (:

DSC is not connecting on VAHAN4 site . Problem while connection of DSC. https://vahan.parivahan.gov.in/vahan/vahan/ui/form_documents_upload.xhtml

Sometimes when I click on a stored bookmark all I get is a white page and no info.? when this happens I right click on the firefox icon in the taskbar and go to a new private window and after that I can get to the bookmarked site. wondering why this happens at times. I am using windows 10 for now but am planning to build another computer with windows 11 in the future.

Since the 26th of Feb. my thunderbird stopped downloading emails from any of my GMail accounts. I've accessed the email and i have a bunch of new emails there but for some reason they are not transferred to thunderbird anymore. I'm think i've installed a new thunderbird version around that time but im not really sure if that was the cause.

Also, no error message appears. it just says no new emails.

Already cleared the login details and logged again, still same issue. I'm using pop connection.

today, when I clicked on the Thunderbird icon (on my desktop PC), instead of my usual window popping up, an odd looking window came up instead that asked to sign into my account using my username, email address or mobile number. But when I tried (several times), none of them were recognised and now I can't access any of my emails because now when I try I get a message that says "Edge: Too many requests" ... this is followed by a pop-up window (bottom right), that says, "Authentication Failure while connecting to server imap.aol.com. This in turn is followed by another Crash Report window (attached screenshot).

I tried uninstalling Thunderbird, deleting cookies, etc, then reinstalling ... but no change.

My shortcuts keep disappearing from my home page when I turn my computer on. Sometimes it's fine, sometimes I have to spend a long time trying to find them. Sometimes I just have to restart Firefox. Sometimes I have to go into settings. Sometimes I can't work it out.

Has been happening for the past month or so.

Dear Mozilla, I have enjoyed Firefox and I always appreciated the vast headline stories recommended in the past. Recently, there seems to be a change where every recommended article requires a paid subscription, i.e. Slate Plus, I already pay WAPO, NYT, WSJ, San Diego Union Tribune, Arizona Republic that i cannot afford to pay each and every website. I would be very happy if you could tell me where in my settings i can set it to show only free articles or perhaps my screen could show a little green dollar sign saying if article was behind a paywall. thank you for your time in reading and assistance. Carl

In all webpages, including Firefox settings pages, text appears like poorly chosen Cleartype settings. This does NOT apply to the menu and Address bars, nor the drop down options in "Which topic best describes your question?" that appears when asking a question here. Troubleshooting mode does NOT solve this, however switching profiles DOES, so I imagine there is a setting responsible for this however I've reset all font-related settings I could find. I've attached a screenshot of the result on this page. Choosing alternative fonts does NOT solve this.

Windows10 simply multiplies the numbers of active Mozilla Firefox Apps which are open. Every day for about two weeks I've been having to delete hundreds of Firefox Apps open in the Task Manager. So many open in a very short time it locks up the Win10 system. I've attached a pic

Win10 will no longer let me download & transmit a .jpg file, sorry

bold text all my passwords seem to have disappered on my desktop, I checked my mobie app and they were there. there was a message to sync this morning on sign in.

My Firefox shortcuts keep disappearing: this is an almost daily occurrence. Sometimes they re-appear later without any intervention, sometimes they re-appear after a reboot. Right now, after rebooting and 'fixing' Firefox from Control Panel, they are still missing. I have 4 rows configured for both shortcuts and recent sites, and had 'pinned' about 20 shortcuts. Currently on Windows 10, soon to upgrade to Windows 11.

Can someone PLEASE tell me if there is a fix available for this (will it be resolved in Win 11?), or if there is a way to easily save and restore these backups when this problem occurs.

The ability to have 32 shortcuts is the motivating reason for my using Firefox over Chrome or Edge (which only allow 8), but if they keep disappearing like this I'm going to have to re-think my browser selection.

Thanks for any suggestions.