Expired certificates have recently caused a lot of chaos, including for Chromecast users. With that in mind, Mozilla is now urging all Firefox users to immediately update the browser to the latest version.
The reason: an older certificate expires on Friday, which means users who have not updated for a long time could be in trouble. According to Bleeping Computer, this means warnings about stolen passwords and malicious websites can no longer be displayed.
Firefox isn’t the only browser affected; others that use the same certificate include Tor, Librewolf and Waterfox.