According to benoitgirard all versions of the Firefox web browser will be updated to version 33.
All updates will be available on October 14, 2014.
Firefox 33 introduces several changes.
This are visible on the frontend while others improve the browser in the backend.
This feature will move compositing to a second thread to make the main thread loop more responsive.
Also Firefox Beta, Aurora and Nightly versions will be updated to version 34, 35 and 36 respectively.
You can download Firefox 33 directly from Mozilla.