Yesterday, Mozilla released Firefox 62.0.3, which includes fixes for two critical security vulnerabilities in previous versions of the popular web browser.
The two vulnerabilities addressed in Firefox 62.0.3 are described in some detail on the associated security advisory page.
Depending on how your Firefox is configured, it may display a small update dialog, or it may simply update itself. To control what happens with new versions, navigate Firefox’s ‘hamburger’ menu (at the top right) to Options > General > Firefox Updates. While there, you can click the Check for updates button to trigger an update if one is available.