Mozilla has released an emergency critical update for Firefox to squash a zero-day vulnerability that is under active attack.
This is a bad thing.
What's worse, Mozilla says it has already received reports that the flaw is being actively exploited in the wild by miscreants, making it critical for users to install the latest patched versions of the browser.
Fortunately, because Mozilla automatically updates Firefox with new patches and bug fixes, both Linux, Mac, and Windows PC users can install the patch with a simple browser restart.
Credit for the discovery and disclosure of the bug was given to Samuel Groß of Project Zero. ®