One security fix and a handful of other bug fixes were released in the form of Firefox 68.0.2 on August 14.
The lone security fix closes a hole in the way Firefox handles saved passwords. Before Firefox 68.0.2, it was possible to extract password information from the browser’s encrypted password database — even when it was protected by a master password — without entering the master password. That’s a rather large and (at least to anyone who uses Firefox’s password store with a master password) disturbing security hole.
As always, you can wait for Firefox to update itself, or expedite things by navigating the browser’s ‘hamburger’ menu to