The first issue addressed by the security patch is a flaw that could let a hacker set up a malicious Website that causes the browser to crash, but lets the hacker into your system. The second could trick you into installing an add-on that lets hackers inside.
Security Week reports that it found no evidence these vulnerabilities had been used by hackers, but nonetheless, you should get the security patch now if you're a Firefox user. Here's how:
Firefox ordinarily updates itself when you open it; this is the default setting. But if it hasn't, visit mozilla.com/firefox for the latest version. Keep your computer safe from hackers - check back to our Happening Now page often to keep abreast of all the latest digital security threats.