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I waited for a long time to do an upgrade to avoid problems. Today finally I decided to upgrade to the latest version of Firefox for my iMac, 147.0.1. Before the upgrade I successfully used with zero issues gemini.google.com/app . Now the website comes up, but regardless what I enter as a question I only get an error message stating "something went wrong". The same website works with no issues (TG) with Safari.

Does anyone else experience the same? Is this a known bug with this version of Firefox? Is there a work around for it? Is the solution just using Safari?

I have an email filter set for a domain that has been sending many spam messages. It was working but now they have started to use my name portion of my email address in their email address. For example, if my email address starts with bobp@ then the email address at the top of the email is bobp@ncqkl.com. The domain is real.

The only option for the first column of the filter I am aware of that can be used is "From", "Contains" and "Email Address". I don't believe Thunderbird allows domains. I have tried ncqkl.com to no avail. Somehow they are getting around filters by using your email name portion. They were also using multiple different addresses all with the ncqkl.com domain.

Is my best bet to use the adaptive spam system? I haven't really used it in the past as I haven't needed to. I don't get much spam usually as I don't have much of a presence on the net. Just lately the amount of spam has increased considerably.

Please help with changing font for outgoing emails. I have clicked on Thunderbird settings, general, then fonts - Ariel and 15 is selected but another serif type font is produced. Very puzzled!

Can I permanently turn off InformationUpdate available' which appears each time I open Firefox. I must click Dismiss to close it. The problem is that after each update, many services to which I log every day, state that I am logging from a new device and I must complete a time consuming procedure of adding a new device in many places. And I don’t need most of the updates.

Hi,

I cannot see any formatting bar in my "new message" window. I cannot change my text format, I tried to change a lot of settings but nothing seem to work.

I also cannot customize my signature - the html just shows weird and not as expected

Thunderbird refuses colored text on new Lenovo 17" Idealpad and adds asterisks not written by the author. Example message test: bbbbbbbbbbbbsssssssss ggggggggggggg***234*5678,56 *<==============* The written numbers and the arrow were colored red. No asterisks were written in the message sent. When writing, colors appeared correctly in messages with no asterisks on screen. However, no colors appear and asterisks are added in recorded messages sent and received on the PC. The Lenovo PC works OK in general, so it must be a Thunderbird configuration/function problem on my PC as the message is correctly received with colors without asterisks on my mobile phone. Can you help me correct this PC anomaly? Many thanks

Firefox Account verification emails never arrive. Password works. Sync works on existing devices. New device verification email is never delivered. Account appears stuck in verification state.

Recently Mint upgraded my FF to v147 - possibly relevant, possibly not. There's no post mentioning anyone having this issue on the Mint forum though.

In my Settings, "Open previous windows and tabs" is definitely enabled, but it doesn't happen. I only get my homepage custom URLs.

I went into troubleshooting mode and FF then behaves.

So I figured the issue must be with an extension - but I disabled all my extensions, and it doesn't help. Only going full troubleshooting mode fixes it.

What do I do next please?

Through extensive troubleshooting, I am unable to get firefox to open at all.

I've done a full uninstall, cleaned all user directories, program files / x86, program data, appdata roaming and local, etc. I used the Microsoft uninstaller and even Revo Uninstaller to remove everything related to Firefox, did a restart and reinstall of the latest one and it still won't launch.

Firefox was previously working until a reboot occurred and now it won't launch.

Firefox 32 bit seems to work when installed, and running Firefox as an admin previously worked but no it no longer does.

I looked at the following articles: - https://support.mozilla.org/en-US/kb/firefox-wont-start-find-solutions - https://support.mozilla.org/en-US/kb/profile-manager-create-remove-switch-firefox-profiles - https://support.mozilla.org/en-US/kb/profile-manager-create-remove-switch-firefox-profiles#w_start-the-profile-manager-when-firefox-is-closed

There's no malware on this machine (business EDR on it, even disabled it as a test and it still didn't open).

I was able to launch the profile manager but now I am unable to as the processes launch in task manager and then within 5 seconds they close.

Firefox is not running in the background for any user (I'm the only one logged in after a reboot as well)

I'm unable to open in troubleshoot mode either. Tried run as and admin cmd "C:\Program Files\Mozilla Firefox\firefox.exe" -safe-mode

Ran SFC / scannow / DISM restore health commands as well and both came back fine / no integrity violations

Since one of your updates, all of my photo files now have your logo on them and I can see any of the thousands of photos I have What the hell did you put in your update? JUST STOP SENDING UPDATES EVERY DAMN TIME I TURN AROUND.

Am having prblems authenticating oauth microsoft 365 from tbird ubuntu.. Everything was working fine but suddenly getting auth failures. Phone works fine, and all software is up to date.

I need to fix TB to send/receive/save emails after a power failure today, Grid outage at 13:40, Power restored 13:40. Computer restarted, TB opened but will not perform any send/receive/save tasks. TB Message Send gets Outlook notification - Authentication failure. Went to Outlook email, logged back in, test email I had attempted to send by TB is in Outlook, plus new emails in Outlook, but none in TB. Checked for TB updates, current as of Jan 15, 2026. Restarted computer twice. Outlook email works but TB does not perform any tasks. I lost no TB emails in my messages before the power failure, they are all still in my TB messages. I have Firefox Browser and Windows 11. I love TB. It has had cardiac arrest. Help. Ann

Have no idea to whom I was chatting a week or so ago, but outlook.office365.com was recommended to me as the incoming server setting for Outlook.com. Set TB that way and used it for a week or so. TODAY got a "failure to authenticate" error from TB (have had many such errors before). Went directly to Copilot, as I thought it would be the most authoritarian place to clear up Microsoft problems. It provided the informaiton below: Official Outlook.com Thunderbird Incoming Server Settings (2026) IMAP (recommended) Settings Server name: imap-mail.outlook.com Port: 993 Security: SSL/TLS Authentication; OAuth2 Username; Your full Outlook.com email address

Why this is the correct server Outlook.com, Hotmail, Live, and MSN accounts do not use outlook.office365.com .

Set outlook account incoming server to imap-mail.outlook.com and reset TB Immediately got: Mozilla Thunderbird Thunderbird Authentication failure while connecting to server imap-mail.outlook.com.

Can someone please tell what's going on?

Can't access or re-add my existing outlook account to thunderbird 147.0. Tried using my password, an app password. Nothing. Keep seeing the same error over and over again.

The weather widget is set the country I am from, however I would like to actually use a different location for the weather. Is it possible to do? I tried to type in the city I want it to be set to but it only shows cities from my country.