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I have a profile that causes odd behavior, within the profile, and to the OS.

Regarding the profile itself:

1. I use Multiple Tab Handler, which should allow me to move tabs on the tab bar with the mouse, but it does not (see image of proper behavior)

2. Normally, i can drag this padlock button to the desktop to create a shortcut. but now, it will not move/drag (see image 2)

3. I also have a backup profile from several months ago that has none of the above symptoms. However, If I substitute it's sessionstore.jsonlz4 file with the the one from the problematic profile, all the bad behavior mentioned above re-emerges.

I know this sounds strange, but, I also get external display issues when using the broken profile. These events are random, and manifest themselves differently, so I can't duplicate them. Essentially, these snips are examples of images from the taskbar tabs, or the clock area, suddenly superimposing themselves on the top portions of the taskbar toolbar area.

This is the view of my clock area (see next image 3)

In the following image, imagine that the portion on the left, that opens the start menu, is now hidden under what looks exactly like the clock area on the right, superimposed over it (see next image 4)

Those aberrations are removed by simply moving the mouse cursor over them, but they will continue to occur in any number of variations over any area of that top toolbar.

Is there a Session Manager that will save the session, to be later restored into that previous profile, but not also pass along the corruption?

Updated to Thunderbird 116 for Mac and now cannot send emails -- on two different machines: one an iMac (OS 18.5), the other a MacBook (OS 17.x).

About 10 or 20 seconds after hitting "Send", we get an error message saying "Sending of the message failed. An error occurred while sending mail: Outgoing server (SMTP) error. The server responded: EHLO [13 hex characters] internal error AUP#EML-005."

Our settings and password have not changed, and they are all correct according to our ISP.

Have tried a clean re-install. Did not help.

What to do?

I changed hosting services because support on the former one gradually became nonexistent. Okay, now I have two sets of mailboxes on Thunderbird, one set on the old server (messages up to February 2025) and one set on the new server (all messages thereafter). Yesterday I set about migrating to get all the messages onto the new server so that I can discontinue the old service entirely. Mailbox by mailbox I copied my entire email filing system successfully – with one exception. When I tried to do this with my "Sent" mailbox, the messages just don't move.

Okay, try a workaround: on the old server I created a new mailbox called "Sent messages" (in contrast to the built-in "Sent" mailbox). I moved all my messages from the "Sent" mailbox to that one. Success. Now I tried moving (or copying using the alt key) messages from "sent messages" to a mailbox of the same name on the new server. Nothing happens. Or perhaps, sometimes it copies the one message that I directly pointed to but will not do a mass move or copy.

I'm guessing that it has an issue with moving messages that are 'from me'. But I really want to save this history! is there some good way around this issue?

Is there away i can get my browser history and data back ,i logged out of windows couldnt remember my password ,logged in with a new password and all my data is gone .....

After my pc has been on for a while, seemingly random duration, Im not able to open firefox anymore. For example if clicking on a link in discord, or if I close the browser and want to open it again. I've tried refreshing and reinstalling but that didn't help.

TB New V140 has an issue: when adding a new email account the wizard stays in a loop, no information why and no option any more to add the account data manually. No idea why it's necessary to keep users out from a manual setup and let them use a not working apple style wizard....

Me and my colleague are using the same email account on Thunderbird. How do I delete the account from only my Thunderbird app? My colleague will still need access to it.

In Thunderbird mail I set Appearance to my personal preferences...

For me my preferences are : Table View, Non Threaded and Sort By Date In Descending Order Applied to all folders...

There does not seem to be any specific function to save these settings.

So... Whenever I restart my computer my preference settings are ignored and my email account subsequently displays the opposite settings.

Am I missing something --- Or is this a new bug ? It never used to be an issue !

Ich habe eine E-Mail Adresse seit 25 Jahren (die will ich auch nicht verlieren- Kinder ,Enkel und Freunde kennen die Adresse) Jedesmal wenn ich ein Neues Passwort Neu generiere kommt diese Antwort "Der Posteingangsserver wird bereits verwendet" So ein Müll gibt es bei keinen anderen Anbieter. Wie kann ich dieses Problem lösen.

Bonjour, Je classe mes mails dans des dossiers par thèmes. J'ai perdu 2 dossiers. Est-ce possible de les récupérer ? comment faire? Je ne les ai pas supprimés, ils ont disparu ! J'ai accés à ma messagerie avec mon Mac et mon Iphone sur Thunderbird. Merci de votre aide Thank you !

I use Thunderbird as main email client on PC, I also access via iPAD email

On iPAD if I get a Calendar invite (eg Teams) I can scroll to bottom of the invite, and there is an option to add ICS file to Calendar. I click on it and it pushes the invite to Google Calendar, and it inserts the correct appointment.

However on my main device (W11 PC) Thunderbird does not show any ICS file. There is a banner that say "This message contains event information. Enable a Calendar to Handle it" Can it be configured to use Google Calendar as the linked Calendar ? If so, could someone explain to me how to do this.

Yesterday I synced Firefox desktop to iPhone 13 and iPad 11. I created an account. The syncing worked.

Today I tried to access one specific website and got this message: "500 server error. Oops. Sorry. Your request could not be carried out because of an error. Please log out and sign in again". That didn't work.

I tried accessing other websites within Firefox desktop Version # 140.04 64 bit. They do work.

I don't know if this service error is something within Firefox or within Windows 10 latest update, or something else. I've reviewed system Administrative Events and there are numerous notes for 7/18/25. Many say "Distributed COM" some are Service control manager, many entries "Device setup manager". I have photos of several screens.

I've deleted cache and history (I use private Mozilla). I've restarted the laptop PC twice. No change to that website access. I used troubleshooting and that didn't help at all.

Please help diagnose where the problem is and how to fix it if the source is my computer. If it's a server problem please advise. Thank you. JHL

Is there a font setting to change JUST the font size (event title field) that is displayed on the TB Calendar monthly grid view. Was able to change overall size in TB, but did not really want same change on mail views? Perhaps a specific TB setting (or userchrome command)?

Yes, I did see the question on Calendar Event font size changes, but not applicable to this as I read it...

Thanks for any suggestions, if any....