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Emergency Bulletin: Firefox 0 day in the wild. What to do.
Update at 2:32pm PST / 5:32pm EST: Firefox released a fix for this a few minutes ago. Update to Firefox 50.0.2 now to patch this vulnerability. Tor have also released a fix with version 6.0.7 of their browser.There is also a Thunderbird fix out, version 45.5.1. I also posted an extended update at the end of the post including data indicating this exploit may be part of a law enforcement operation.
See the full article about this FIrefox Security Issue. You can easily update FIrefox by going to help and about for minor auto updating. The only issue with doing it that way is you may have to go there several times before you are on the current release. Otherwise download the full version from the link above.
Also anyone with WordPress sites, it’s a good idea to check for updates to fix security issues like this.