on windoze Start Firefox [ do not open any websites ] Click Help Then click About Firefox It should autoupdate, then click restart to apply the update If the menu is not visible right click at the top above the address bar then select the menu bar to activate it. on Linux [ ya have to be root or use sudo ] Code: apt update apt dist-upgrade or [ ya have to be root or use sudo ] Code: yum update and so on
To check, clik on "help" on the Ff tool bar, clik on "about Firefox" and see what ver is on your machine. You MAY need to reboot to complete the install.