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Hello. I have a question about Firefox. I shut down my PC and turned it on two hours later, but Firefox is still displaying page layouts properly, images on pages aren't displaying, and the screen remains blank even when I load a page from a bookmark. How can I fix this? This is the first time I've seen this happen, whether I've restarted or shut down and restarted.

Windows 11 : Fix this ASAP I delete all tabs, close firefox, reopen and I get 5 tabs which seem to be STUCK. I delete 3 of these tabs, go about my work, none of those 3 are open, and I shut everything down. When I reopen Firefox, those 5 "default tabs" (the 3 I don't want have migrated over from I don't know were - both Chrome and Edge open with New Tab.)

I have enough other problems in my life - and done't tell me to create a new profile. At that point I'll kill firefox and end my donations to Mozilla.

I get this error ALL THE TIME from TB. Sending of the message failed. The message could not be sent because connecting to Outgoing server (SMTP) smtp-mail.outlook.com failed. The server may be unavailable or is refusing SMTP connections. Please verify that your Outgoing server (SMTP) settings are correct and try again. Copilot says that TB is NOT recognizing my personal Outlook email account as a viable SMTP account. Been on line with Copilot for couple of hours without success. Does anyone at Mozilla have anything to offer me?

I am unable to send emails (but can receive). When I try to send an email with an attachment, I get the pop up that states "Login to server smtp.(companyemail).com with username icclabcalibrations@(companyemail).com failed". Once I hit "retry" twice, another message pops up that says "Sending of the message failed. The message could not be sent because the connection to Outgoing server (SMTP) smtp.(companyemail).com timed out. Try again." Once I try again, a third message pops up saying "Sending of the message failed. An error occurred while sending mail. The mail server responded: ...authentication rejected. Please verify that your email address is correct". I have made sure to check that the connection security settings are correct as well as the outgoing server settings. I have also edited my email and replaced it with "(companyemail)" for privacy reasons.

I cannot send from an Office365 account but can get mail - it simply says 'sending' but nothing happens.

I am using Owl (paid subscription) for my Office365 account.

I also have another email that is a simple IMAP account and that works beautifully!

I have a few folders I need deleting.

They do not appear in my webmail (mailserver) but do in Thunderbird - I have tried so many methods on your forums, but nothing is working - can you help?

When I launch Thunderbird, a window opens on yahoo.com. even though I didn't ask for anything.McAfee and Defender do not detect any viruses thanks for your help

I have used Thunderbird for years. Suddenly it asks for my email account password every time I send an email message. What is the problem? The passwords for my email accounts have always been stored in my configuration and it never asked for them. Very annoying.

TB on Windows

Prior to TB 148, OAUTH worked for POP3 access to: Gmail, MS Outlook, and Yahoo.

After TB 148 upgrade: OAUTH to Yahoo fails, subsequent log-in page also fails. Both OAUTH to Gmail and OAUTH to MS Outlook still work fine.

Rolled-back/Reverted to TB 147.0.2 -- OAUTH to all works fine, as it did previously.

Note: YahooMail seems to have other problems. But I was able to confirm successful OAUTH and POP3 to YahooMail after reversion to 147.0.2.

We have been unable to find an explanation of what components of the password file data, like created & modified date, can be included nor any formatting requirements. We've read that only the url, username & password are necessary... does that imply that the date/time fields would not be included if provided when imported?

Following the format of an Exported CSV password file seems reasonable... but risky as it could corrupt the existing file?

On my Linux machine, I exported the public key for an email address in Thunderbird 140.8.0esr (64-bit) into a file. I transferred the file to my Windows 11 machine via Warpinator.

On the Windows machine I am running Thunderbird 148.0.1 (64-bit). In Account settings>End-to-End encryption, I click Add Key>Import an existing OpenPGP key>Select File to import, and then I select the file.

I get an error message: Error! Failed to import file.

I'm surprised. I would think that going from one installation of Thunderbird to another would work this way. I am concerned that I won't be able to read incoming encrypted emails without the key working.

Can someone help me?

The sound works for me on Opera (PC Win11), but not on Mozilla - I see it as a bug in the browser... even after clicking on the playback device in the bottom right corner in Mozilla, the sound doesn't start playing...

Secure Connection Failed

An error occurred during a connection to cow.huntforenenst.com. Peer received a valid certificate, but access was denied.

Error code: SSL_ERROR_ACCESS_DENIED_ALERT

   The page you are trying to view cannot be shown because the authenticity of the received data could not be verified.
   Please contact the website owners to inform them of this problem.

I just accidentally deleted a day of history, now it has to relearn a bunch of stuff.

Please add support for undo, so that if you do it by accident, you can reverse it.

Whenever I open a new firefox page externally, such as from the system tray or by opening a link from outside firefox, nothing happens for about five seconds and then it loads normally. When I open a new firefox page internally, such as from file ---> new window or by clicking a link within firefox, it loads instantly like normal. This has been happening since yesterday (3/13/26) evening.

I have already tried all of the following fixes and none have done anything:

Clearing firefox startup cache running firefox in troubleshoot mode running an older version of firefox disabling all my extensions disabling my antivirus disabling hardware acceleration disabling captive portal detection making sure both firefox and windows 11 are fully updated refreshing firefox reinstalling firefox rebooting my PC disabling IPv6 preventing accessibility devices from accessing my browser clearing my cookies

Importing CSV address books does not work properly. The resulting folder cannot be accessed by emails to be sent.

The imported Address Lists cannot be used in an email as a list. The error message is that the address is not a valid email address. However, if a new Address List is created with the contents of the imported file manually copied, then it can be used as an email address.

I also found that clicking on an individual address in the imported csv, will open the individual email address.

So the addresses are valid but the list is corrupted.

A few days ago I started getting a failed sign in for one of my emails. The solution seems to be that my authentication method in ≡ > Account Settings > Server Settings does not give OAuth2 as a choice. Screenshot shows what is available. All other email authentication methods have that as a choice. Is this a problem with the email program or T'bird? T'bird is 140.8.1esr (64-bit) O/S is Win11 Thanks for your help