If you don't have an updated browser, you could be in trouble. Credit: Mozila Firefox 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. SUBSCRIBE TO OUR NEWSLETTER From our editors straight to your inbox Get started by entering your email address below. Please enter a valid email address Subscribe