Mozilla has been forced to strop distributing Firefox 65 for Windows via its automatic update system.
Firefox for Windows was released on the 29th January 2019 and introduced tracking protection enhancements, interface language improvements, and support for the AV1 and WebP formats
Unfortunately, it also introduced a number of issues, with Bug 1523701 on Mozilla’s bugtracking website complaining that it was no longer possible to connect to websites using Firefox after the upgrade to the new version of the browser, with the browser showing the error “Your connection is not secure” SEC_ERROR_UNKNOWN_ISSUER.
The problem appeared to be due to an interaction with antivirus applications such as Avast and AVG, leading to Mozilla suspending the automatic distribution of the browser on Windows. It is still possible to download the browser manually while Mozilla investigates.
Avast is also contributing to a temporary fix by releasing a patch for AVG which disables HTTPS filtering for Firefox while the company works on a more permanent solution.
In the meantime affected AVAST users can open Settings > Protection > Core shields > Web Shield (under Configure shield settings) and uncheck Enable HTTPS Scanning. The same solution may work for other antivirus products affected.
Firefox users may also set the preference security.enterprise_roots.enabled to true on about:config. The preference causes Firefox to recognize certificates added to the Windows Certificate store.
Once the issue is resolved Mozilla will start pushing out the update again.
Have any of our readers been affected? Let us know below.