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I've noticed that Mozilla products (firefox, thunderbird etc) all phone home all the time, which is a violation of both my security as well as privacy policy. In the firewall one can observe persistent, periodic, repeated connections to various non-sanctioned sites and services, apparently run by Mozilla. These include, but are not limited to:

• .mozgcp.net
• .services.mozilla.net

firefox-portal-detection.com etc.

Specifically, there are persistent, periodic and repeated connection attempts to (just copy/pasting from the first page of firewall report; there are many more as well as similar connection attempts from thunderbird as well): firefox-settings-attachments.cdn.mozilla.net:443 assets-prod.sumo.prod.webservices.mozgcp.net:443 content-signature-2.cdn.mozilla.net:443 push.services.mozilla.com:443 etc

These begin at the startup of the browser/mua and continue throughout the session. Given that none of the sites actually browsed have anything to do with mozilla per se, and given that various privacy-violating features such as DNS-over-HTTPS (yes, that's a not a privacy-enhancing feature but the opposite - it just shifts the surveillance point from the ISP to the DoH provider) and other similar "features" are disabled in-browser, there should be no user/browser connections attempted to mozilla servers.

Also, by setting up a local security MITM proxy in order to observe and analyze the content sent to and received from these services and configuring the browser to connect via the proxy, the browser seems to *stop* trying to connect to these services, which indicates *active* measures by the browser/mua to avoid it's browser-fingerprinting and location-revealing content from being intercepted and analyzed.

This is especially concerning as Mozilla actively brands and markets it's products as privacy-respecting, as for-user-rights and as away-from-big-tech-dominated. Consequently I perceive this as complete breach of trust. Even by just *attempting* such phone-home connections a leak of metadata occurs, identifying the IP, the browser and consequently the user and user's location, sometimes actively (such as was the case with now apparently discontinued location.services.mozilla.net). Combined with whatever content these connections carry, this constitutes a serious breach. And there seems to be no way for the user to configure the browser to stop making these connections, other than by using an external application firewall.

And to top it off, with Firefox version 155.0.1, the browser now outright refuses to connect to *any* sites at all if firefox.settings.services.mozilla.com:443, firefox-settings-attachments.cdn.mozilla.net:443, firefox-portal-detection.com:80 and content-signature-2.cdn.mozilla.net:443 are *externally* blocked, at least on that profile (which worked just fine prior to upgrade to 155.0.1), showing a spinner and waiting indefinitely (not even timing out). These are the *only* connections it even attempts, completely ignoring the actual site that it was told to connect to. So that's at least 4 privacy-violating, security-policy-violating phoning-home connection attempts and a complete disregard for user's actual, sanctioned connection request.

all of a sudden I'm not getting any new emails and some of my emails that I got won't come up or unbold. I didn't do anything to the program. I haven't fooled with it. I saw there was an upgrade recently from 154 to 155. when did this happen?

I have 5 email accounts on my desktop and the emails are doing funny things. Now they finally loaded but they aren't coming up or unbolding in one of the addresses. In another address I was able to pull up the emails and they unbolded but then all of the new ones bolded again and I couldn't pull the last two up

do you have to contend with Windows upgrades? Do windows upgrades affect Thunderbird? I don't 'fool' with my computer as I'm not very computer literate.

Thunderbird not connecting to server. It says timds out and an error occurred connecting to mobile.charter.net. I can neither send or receive emails. This started 8/20/2026

I received a notice from you regarding a data breech with Post Millennial I never signed up for Post Millennial. I look it up and there is a fee to access. I don't pay for information of any type so what is my next action. Is someone using my email to access sights?

Thunderbird 143.0.1

My TBird updated this morning and everything turned to crap...

I have TBird set to check for emails every 15 minutes on 4 accounts. There are also 3 accounts that I monitor and check manually...

As soon as the 143.0.1 update touched home base TBird went ballistic. Withing in seconds of it checking for mail on the four accounts it then started deleting the accounts. Any mail was down loaded then poof!! No mail and No mail account. I had to crash dive my laptop to to stop it. Spent 3 hours trying to recover the emails and accounts and managed to reclaim 3 accounts out of the 4 but lost all the emails... After all that effort I was totally peeved and decided to uninstall TBird and revert to an older version... The icing on the cake TBird wont unistall because the YES button on the TBird Helper window wont activate...

After more than thirty years of supporting Firefox and Thunderbird... You have really dropped the ball with this one... As far as me getting an email when someone answers the thread... Good Luck...

Hi!

I can't get messages from my Thunderbird account. When I click "Get messages" nothing happens and it usually says "Done" on the bottom left corner. I have to use my domain's webmail account to get my e-mail and it only allows me to read it and delete junk.

I really would love to have my Thunderbird account working again as soon as possible.

Thanks so much, Nancy Pedersen

Issue description

Firefox keep self logging me out from the synchronization. This requires urgent fixing.

Expected result after fixing

Firefox should never (unconditionally) self logout the user from any devices and services (with includes synchronization

Proposed enchancement

Firefox should allow to be simously logged into services (like sync) from multiple authorized devices in same time, instead beeing selective

Had my laptop serviced at Best Buy, but upon booting it up the icon for 1Password in the upper tool bar was missing. Trying to figure out how to add it back. I use Mozilla Firefox and have Windows 11.

Setting up a new Macbook air m5 and trying to sync my profile/bookmarks/etc. on FireFox but the confirmation code is not arriving at my gmail. Checked spam and added "accounts@firefox.com" to my contacts but still not arriving. Help?

I have settings from Greenby to set up server connections for a new account. They are validated by thunderbird but, after, entering my greenby password, generates the error, below, which greenby claims is a thunderbird problem.

"Component returned failure code: 0x804b000a (NS_ERROR_MALFORMED_URI) [nsIIOService.newURI] Show less

Component returned failure code: 0x804b000a (NS_ERROR_MALFORMED_URI) [nsIIOService.newURI]"

Now my greenby password works on their systems

Now I'm very new to Thunderbird so not familiar with the commands

Any one any ideas ?

As of September 3, 2026 all my new emails are going into a random folder instead of the inbox. This is also happening on my wife's PC plus and we are not getting the emails to our iPhones until we get out of Thunderbird. What has changed? This has not happened before.

I've been using Thunderbird on Windows 10 since last year sometime. Currently I'm on version 151.0.1.

I've 4 x mailboxes here and since yesterday, 3 of them show me an unusual message when checking for emails. I tried attaching a screenshot but although the screenshot uploaded, I couldn't find a way to insert it here. But the message says Unable to write the email to the mailbox and asks me to check if I've write privileges (which I have) and to cheek the available disk space.(currently 101GB free).

The message is happening 2 or 3 times each day and lasts for about half an hour, then everything works fine again. Has anyone else seen this??

This device is essentially a thumb drive made by MOPAR that contains automotive serve diagrams for a Jeep Wrangler. When you boot this device with Firefox being the primary browser you get garbage instead of schematic drawings. If I make Edge the primary browser the card boots properly and runs. This a legally obtained card with no password system on board.