HomeWinBuzzer NewsMozilla’s Firefox 65 Caused HTTPS Filtering Issues on Windows PCs

Mozilla’s Firefox 65 Caused HTTPS Filtering Issues on Windows PCs

Firefox 65 users reported last week an issue where the new browser was not accessing websites on PCs running Avast and AVG.


Last week, rolled out Firefox 65, the newest version of its popular web browser. However, despite several new features, the browser caused problems for users. Many PC users reported seeing “Your connection is not secure” messages when trying to access popular websites.

The problem seemed to be directly linked to AVG and antivirus programs clashing with Firefox 65. Specifically, the error message appeared when an HTTP website was visited.

This was happening on all sites, even major services. Users reported seeing ‘Certificate is not trusted because the issuer is unknown' and that ‘The server might not be sending the inappropriate intermediate certificates'.

Mozilla reported the problem on its bug report portal. The company says the HTTPS filtering feature found in AVG and Avast is stopping users from visiting HTTPS websites. It is worth noting that AVG is owned by Avast.

Solving the Problem

One obvious way to negate this problem is to simply not use those two antivirus services. However, plenty of users are tied into those services for various reasons. With that in mind, Mozilla says users should pause automatic updated on Windows.

Avast has released an update for its antivirus and AVG. The update turns off HTTPS filtering in Firefox 65, while the feature is still available on other browsers.

We guess the company will fix the problem and bring HTTPS filtering back to Firefox at some point. For the time being, pausing the feature gives the company time to work on a fix.

Last Updated on February 26, 2019 11:18 am CET by Markus Kasanmascheff

Luke Jones
Luke Jones
Luke has been writing about all things tech for more than five years. He is following Microsoft closely to bring you the latest news about Windows, Office, Azure, Skype, HoloLens and all the rest of their products.

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