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I have received an email from what looks like Mozilla, it says that there has been a massive data breach and my details were compromised. I'm checking to verify if this is correct.

Today (February 25, 2026) I received an email notice, apparently from Mozilla Monitor, advising me that my "Email addresses, Partial credit card data, Passwords, and Phone numbers" had been exposed in a data breach at Canadian Tire. This email seemed legitimate (the sender was breach-alerts@mozilla.com), but since it gave me a link to login to Mozilla Monitor, my first concern was that this might be a phishing email and it would be dangerous to click on that link. Instead, I went through the Firefox settings to login to my Firefox account and from there, I checked what Monitor had reported. The Canadian Tire breach was not listed there. However, when I went to haveibeenpwned.com, the Canadian Tire breach was listed there. It showed that the breach occurred on October 25, 2025. So why was the breach not listed for me on Mozilla Monitor? And why would I have received an alert from Monitor 4 months after the breach? Was this breach alert notice actually a phishing scam perpetrated by someone using the information from haveibeenpwned.com as bait?

For about the past 10 days or so Tbird has been presenting me with a request for my user name and password for, i am assuming, inclusion as an added account. They want

The problem is that in have no idea who caldav is or where they got my link to Tbird. My concern is that this may well be malicious. They want me to authenticate with username and password. What user name and what password?

Does anyone in the forum know what this is all about and how i can get them permanently excluded? With all the fake / criminal challenges on the net these days, i am very nervous (77 years old).

Any help would be really appreciated. Thank you

It recently came to my attention that Gmail is using my (and others) emails to train their AI to provide "overviews" for email threads. I didn't find that in any of the recent Agreement changes so feel safe is stating Alphabet/Google never obtained my permission for this training. I'm not a fan of the far-flung use of AI and the mounting examples of how horrendously Google AI performs hasn't done anything to relieve my concerns.

I began a search for a better, reliable email client and there is a depressing shortage of them that fulfill the average email users' needs. Thunderbird looks pretty good but reading through the Help section, Community Forum questions and just general articles hasn't clarified a couple of questions I have.

1. Is Thunderbird a comprehensive email client, independent of other clients, or does it provide service by partnering with another client?

2. Does Thunderbird utilize AI for any purpose that requires the "review" and storage of individual users' emails?

Many thanks, MarilynB

2019 MacBook Pro

I prefer to have VPN support no matter how I am using the internet. I would prefer that Mozilla get rid of all of the debug statements in the existing paid for VPN as it is a drag on my system. The debug issue exists on Windows 11, Android 16 and Linux (Debian 13.4).

Hello,

why you advertise a A free VPN you can trust, now built into Firefox ! when it s not free at all ?

https://blog.mozilla.org/en/firefox/built-in-vpn/ best regards

Is it possible to somehow incorporate a virus/trojan checker into the software that is open source for Windows? I keep getting TONS of alerts from Mcafee that it caught viruses. Also wondering if this could be a addition to Thunderbird in a new release by incorporating something like CLAMAV into thunderbird software somehow?

Assuming that I don´t want any Google server to track me what could I click in the attached? It's a nice feature but as it is not clear what the last three options do a bit of a guess.

I just set up a gmail account in T-bird. I can send, but I can't receive. It keeps saying there's no email to get. I use a read-only email app called Mailwasher. I AM getting Gmail email in that app, while it's on the server.

I have gone through the settings in T-bird several times. I even checked on the web. - I entered what you see below (in both Thunderbird and Mailwasher): '"Incoming Mail Server Settings (IMAP) Hostname: imap.gmail.com Port: 993 Requires SSL: Yes Username: Your full Gmail address (e.g., example@gmail.com) Password: Your Gmail password"

I even tried changing the password a couple of times (also had to do this in Mailwasher).

UPDATE: now Thunderbird isn't logging on and wants a new password (which I've done twice already). No reason why.

PLEASE ADVISE. Kami

On Samsung S10e, after install of ThunderBird mobile, transfer of email setup from laptop via QR code gets the message shown in attachment when setting up gmail accounts. Laptop has no issues with ThunderBird accessing gmail accounts. Please describe full process to access gmail on TB mobile when this message appears. Thanks, Malc