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I recently swapped to firefox and have had issues with my tabs crashing. There are days where a tab will repeatedly crash, or not at all. It always crashes on 1 tab. I've tried most of the suggested solutions, profiles change, addon troubleshooting, hardware acceleration, updating/reinstalling. Currently on windows 11.

Thunderbird Email - I am not receiving emails from my energy supplier (E.ON Next) - they say they bouncing. This started around Jan 25. I have spoken to them many time but no joy. E.ON receive emails I have sent to them and I am able to receive emails from just about anyone else eg shop, banks, contacts, etc etc . Can you help me fix this/explain why it is happening? Many thanks Jane

I have had Mozilla Thunderbird for many years and used it daily. Now you are writing to me that you want to close my mail program because I haven't used it for 2 years.

I have 2 email addresses linked to Mozilla Thunderbird: kurtj1942@hotmail.com and kurtj1942@gmail.com. I can receive emails from the Hotmail account, but I cannot send. From the Gmail account, I can both send and receive. Why can't I send from the Hotmail account?

Sincerely, Kurt Jørgensen

Hi, when i wrote an email, and i wont to attach a file from PC, when i select the file with extension .pdf, the file did not shown in preview pane. I try everything i think, but it wont work.

I'm trying to add accounts through the hosting provider Strato, but as soon as I add a new email, it asks for my name and email address, and I can only click "Next." Then it searches and searches, and I can't cancel without forcibly closing Thunderbird. How can I change this? Why can't I do it manually? Antivirus and firewall are already disabled... it doesn't help.

new 143.0.01

Good morning.

Problem 1. I've been using Thunderbird for a very long time. Everything has always been fine. But recently, I've been having trouble sending email from one of my accounts. When I try to send a message, a message appears: enter the password for the user... Entering the password doesn't help, and another message appears asking me to contact the network administrator. I contacted them, but they didn't find the cause of the problem, but they suggested changing the password, which I did, and reinstalling Thunderbird, which I didn't do for fear of losing all my email. Changing the password helped for maybe two weeks, and then the problem started all over again. The problem only affects one email address and only on one computer. Sending messages from that address on Android works without any problems.

Problem 2. I installed Thunderbird on my Android phone and encountered a problem when adding two accounts: the first installed without a problem, but I can't install the second one because every time I try, I get a message that the incoming mail server check failed - unknown error 42.

Problem 3. I'm trying to install the program on my second phone - it downloads 99% from the Google Play Store and that's it.

Is there any way to solve these problems, or should I change my email program? Best regards, Andrzej Witkowski

Thunderbird being used as IMAP client for Gmail - with no issues, until recently when an existing email recipient, who sits behind the Barracuda Networks system, fails to receive mail from Thunderbird's recent versions because it is rejected and blocked by Barracuda. I have tried using plain text formats and checked that SMTP server accounts are correct all to no avail, a 550 blocked is the result. The Thunderbird ver is 143 64 bit - However mail from an earlier 32 bit version 115.5 was successfully delivered, later 32 bit ver 140 failed to deliver through the Barracuda system.

Email from Google's own Web client gets delivered and mail from the Android mobile phone app likewise arrives. A simpler IMAP client (MailSpring) manages to get mail thru Barracuda so what has Thunderbird done to appear a threat to Barracuda ? BTW Mailspring is sort of 'Ok' - but it just isn't Thunderbird - it was installed only as a test vehicle !

when copying/pasting files from windows Explorer using the keyboard shortcut Ctrl+C/Ctrl+V in firefox, only the first file of the copied ones is inserted. there are no problems with other browsers (Google).

Not sure when I download Firefox to new PC ,How do settings I currently have in place transfer to new browser installation?

Also I have bookmarks on a memory card,Will they install to firefox by placing it in drive slot of my new windows11 machine?

Hi, I rebooted Firefox today because a website was frozen, and when it came back, it was asking for a troubleshoot or just continue, and I don't know exactly what that meant, but when I clicked on refresh, everything was changed, including the theme. And then when I tried to restore the theme back to the original it said, add-ons are disabled by safety, and I don't know what that means, and it's not explaining how to undo it. And now everything looks different and I'm not happy with it, and it's not really letting me add any other themes, and if I add them, they don't seem to fully load, the page still looks all white

I have FireFox set up to reset every time I start a new session which causes DuckDuckGo's AI search to reset every time. Does anyone know how I can set it so it doesn't do that? It's annoying always having to disable to every time I open a new session.

I tried to use a ftp link setting firefox as the default ftp app, not realizing firefox no longer supports ftp. I am unable to reset the default app and can't find the setting to do so. I downloaded filezilla and wish to set it to be the default app for ftp. Can someone help me with this? Before anyone suggests it, resetting firefox to default settings is not an option.

Guess I started out wrong , I have a new Win 11 computer with firefox installed , on my old Win 7 firefox machine a new tab always shows several news stories and recently visited sites . How do I get this new computer to also do the same ?

                  Thanks !  Ken

I updated my firefox browser on October 6th and ever since then, whenever I press ALT to switch to a different application (I use ALT + Tab to switch windows) I go back in a tab's history. This never happened before and I'm not sure how to go about disabling whatever function this is. I've checked in the about:config section of firefox but I don't know which of these options is for this function, if it's even in here. Any advice or help would be appreciated!

It only happens on some websites (Wikipedia for one) and doesn't happen anywhere else in my system. I was unable to root out the reason for this and all solutions seem to be for when there are boxes instead. I don't see boxes, only Russian letters for some reason.

A disaster happened, but first, let me say that I had to create a new Thunderbird Profile because Thunderbird was acting really strange and also making my e-mails fail DKIM for some reason. After creating the new profile, things were working better, but still some problems. It's been several days. Twice it marked my own e-mails as Junk, and both times I marked them as Not Junk, but that didn't seem to "take".

An e-mail in my Drafts folder is my "in case of death" e-mail. I was editing it to change the To addresses, then told it to save as Draft. That immediate Draft went straight to the Junk folder. WTF? So I go to the Junk folder, select it, right click, and "Mark as Not Junk".

Instead of going to the Drafts folder, Thunderbird sent it. Not only that, the old Draft of the e-mail was sent also!

I'm royally pissed off! How could Thunderbird do something so stupid? First classify my own saved Draft as Junk after my having marked my own e-mails twice before as Not Junk, then send it when I said it was not Junk? This is stupid.

Needless to say, I had to hurriedly sent a retraction e-mail, then made phone calls.

Something is really wrong with Thunderbird Junk processing. After creating the new profile, I've seen junk e-mails sit in my Inbox for 15 minutes before suddenly Thunderbird decides that they are junk.

Thunderbird WAS a good program, but after having to start over with a new Profile, setting up my e-mail addresses again, install add-ins, go through all the settings again, import my e-mails, addresses, and calendars, then have things still going wrong, I'm wondering why I'm still using Thunderbird.

Is there an extension or add-on that can search like the old Eudora does? The default search does not seem to search thru headers or all email messages This is important for us when we need to find the Senders IP numbers so we can ban the spam emails