"Something seeks to trick Firefox by accepting a security update. Please contact your network provider and ask for help. »

This message appears at regular intervals. I think it is intended to prevent the man-in-the-middle-attacks who want to give you an update of Firefox rogue.

"Microsoft Forefront Threat Management Gateway" with HTTPS inspection is used in my company. This HTTPS inspection is done by installing a local (CFC) Certification Authority in the browser on the user's computer and then performing an of / encryption of SSL flow on the proxy server.

But while Firefox checks the update server certificate, but also the issuer of the certificate, the update is rejected because of a possible Man-In-The-Middle-attack. In the case of the 'Microsoft Forefront TMG' is a planned MITM attack...

Is it possible to change the expected server update in Mozilla Firefox certificate chain?

As a quick fix, you can change pref app.update.certs.1.issuerName to the value used by your Inbox MITM. Or perhaps better, add new Pref app.update.certs.3.commonName and app.update.certs.3.issuerName with the appropriate values. These two prefs could be passed along to other people in your organization as a file user.js, perhaps, or an add-on restartless.

Not an easy to use solution, but you should get going again.

Tags: Firefox

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