Four of the vulnerabilities in the 126.96.36.199 update are rated 'critical', the highest ranking on Mozilla's security scale. The company urges all users to install the update immediately.
Two of the 'non-critical' vulnerabilities involve so-called sub-frames. One could allow an attacker to take advantage of the pop-up blocker status bar to deceive the user into thinking that a blocked pop-up window originated from a trusted site.
Another could direct the user to a trusted site in a new window and then use a sub-frame to steal entered data such as passwords or credit card information.
Firefox is configured by default to download the latest version automatically. Users can also install the update through the software's built-in auto-update feature or from the Firefox website.
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