Just heard from the guys at WordFence that Mozilla released an advisory explaining that nine security flaws had been discovered in Firefox 61.
A new version had been released, and as long as you have automatic updates enabled Firefox will update itself. If you don’t have automatic updates enabled then you will need to do the update manually (and I would recommend enabling auto updates!).
You can read the full details on the Wordfence blog: click here.
P.S. Is your WordPress website as secure as it could be? Take a look at the WordPress security products I have reviewed (I use all of them and I’d be happy to answer any questions you may have):