Both Google and Mozilla have released security updates for their Chrome and Firefox browsers.
Google Chrome has been updated to 41.0.2272.118, fixing 4 security holes—one of which was critical and one that was High. Go to this site for help in updating Chrome: https://support.google.com/chrome/answer/95414?hl=en
Mozilla has updated Firefox to version 37, Firefox ESR to version 31.6 and Thunderbird to 31.6 Here are the update links:
Mozilla Firefox: https://support.mozilla.org/en-US/kb/update-firefox-latest-version
Mozilla Firefox ESR: https://www.mozilla.org/en-US/firefox/organizations/faq/
Mozilla Thunderbird: https://support.mozilla.org/en-US/kb/updating-thunderbird