Firefox ESR 140.3.1 released

[Donal Meehan]

We are pleased to announce that the Firefox ESR 140.3.1 release is now
available for download at https://www.mozilla.org/firefox/organizations/all/.

Release notes for Firefox 140.3.1esr are available at
https://www.firefox.com/firefox/140.3.1/releasenotes/.

As always, we recommend that users keep up to date with the newest version of
Firefox ESR for the latest stability and security fixes.

Thank you,

Donal Meehan,
Firefox Release Manager

[Ruben Gomez]

Nice, just installed it, but the vendor's site partzilla.com is still having issues :( 

see below, still same issue, ubuntu/linux machines

[Benjamin Beurdouche]

Ok. We’ll have a look asap.

B.

On Sep 24, 2025, at 8:39 PM, Ruben Gomez <rigo...@gmail.com> wrote:

Nice, just installed it, but the vendor's site partzilla.com is still having issues :( 

see below, still same issue, ubuntu/linux machines

<2025-09-24_13-38.png>

On Tuesday, September 23, 2025 at 9:23:19 AM UTC-5 Donal Meehan wrote:

We are pleased to announce that the Firefox ESR 140.3.1 release is now
available for download at https://www.mozilla.org/firefox/organizations/all/.

Release notes for Firefox 140.3.1esr are available at
https://www.firefox.com/firefox/140.3.1/releasenotes/.

As always, we recommend that users keep up to date with the newest version of
Firefox ESR for the latest stability and security fixes.

Thank you,

Donal Meehan,
Firefox Release Manager

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<2025-09-24_13-38.png>

[Kahle, Markus]

Hi Ruben, Hi all,

as we also got the the initial problem I can't confirm that this website as any problems with 140.3.1esr.

In our environment the website loads normally ( with sophos firewall, quic blocked and ublock origin active).

Just for some more input in that case.

Regards,

Markus

---

[Ruben Gomez]

did you test from a Linux/Ubuntu 18/22/24.04 machine?

yes it works fine on Windows, but that is not our environment 

also the page works fine on a 128 esr

[Benjamin Beurdouche]

Hi Ruben,

Just a quick word to confirm we are looking into it.

So far no luck to reproduce… If you have not can you 

1) try using a fresh profile

2) try the same version in a different networking environment ?

Thanks,

B.

On Sep 26, 2025, at 11:56 PM, Ruben Gomez <rigo...@gmail.com> wrote:

did you test from a Linux/Ubuntu 18/22/24.04 machine?

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[Yannis Juglaret]

Hi Ruben,

I was able to reproduce this issue on my machine and discussed it with peers. We believe the problem is caused by a failure to load resources stored on assets.partzilla.com. Could you try loading this url for example? If Firefox warns you of a security risk, please check the advanced details—does it mention SEC_ERROR_UNKNOWN_ISSUER, or something else?

If you do see SEC_ERROR_UNKNOWN_ISSUER, that matches the error I encountered. This typically happens with a misconfigured server when using a new Firefox profile. If you wait a few minutes, Firefox should automatically preload the necessary intermediate CA certificates in the background (no action required on your part). Once that happens, the website should start working after a refresh—even though the server remains misconfigured. Could you confirm how long you've been using your current profile?

To be more precise: when Firefox connects to the server over TLS, it needs to verify the full certificate chain. In this case, the server is only sending the end-entity certificate (*.partzilla.com). If properly configured, it would also provide the intermediate CA certificate (GoDaddy Secure Server Certificate (Intermediate Certificate) - G2). Since the server does not send this intermediate, Firefox must locate it on its own before the website can load correctly.

Please feel free to share more details if you think you’re running into a different issue than the one I’ve described here.

Best regards,

Yannis

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[Ruben Gomez]

Thanks Yannis, I will try this later on today!

Sent from my iPhone

On Sep 30, 2025, at 11:22 AM, Yannis Juglaret <yjug...@mozilla.com> wrote:



[Ruben Gomez]

Yannis you nailed! that is exactly what is happening! 

Ok I will pass on this information to the vendor Partzilla 

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[Yannis Juglaret]

Thanks for the feedback Ruben, and glad that you've got things working fine now!

Best regards,

Yannis