If you are running Mac OS X 10.10 (Yosemite) and use Firefox then you should see (about an issue where a change in Apple’s logging may have logged all keystrokes entered into Firefox):
https://www.mozilla.org/en-US/security/advisories/mfsa2014-90/
The main remediation mentioned there is:
This issue does not affect OS X users prior to 10.10. Users on OS X 10.10 should go to their /tmp folder and delete any files with names beginning with “CGLog_” followed by the name of a Mozilla product, such as “CGLog_firefox”.
