Firefox v.33.1 was offered to release channel users on November 10, 2014.
An interesting new item in the Firefox 33.1 release notes;
Firefox gives you even more control over your privacy. The new version of Firefox comes with a Forget button, which wipes out your recent browsing history without affecting the rest of your information.
— Forget button – quickly delete your browsing history on Firefox [Mozilla]
 Firefox features [Mozilla]
 Mozilla Firefox 33.1 Release Notes (2014-Nov-10) [Mozilla]
 Security Advisories for Firefox [Mozilla]