You can check for updates via "Help -> About Firefox" to be sure that a valid Firefox update is available. There have been two recent updates to address disclosed vulnerability issues. *https://www.mozilla.org/security/known-vulnerabilities/firefox.html *https://www.mozilla.org/en-US/firefox/67.0.4/releasenotes/ *https://www.mozilla.org/en-US/firefox/67.0.3/releasenotes/ ---- If you get a pop-up message asking to update Firefox or plugins or scanning for malware then such a message is likely a scam and you should NEVER respond to such an alert to avoid getting infected with malware. *only update Firefox via "Help -> About" or by downloading and installing Firefox from the Mozilla and never via a pop-up or link on a web page. *plugins should only be updated via the plugin itself or by visiting the home page of the plugin. See also: *https://support.mozilla.org/en-US/kb/i-found-fake-firefox-update