It is useful, however, very few options Rated 3 out of 5 stars

very few options... because for me to deleted the cronology it's a long road, it's useful because youtube in firefox it is not perfect.
Other plugins it is perfect http://add0n.com/index_files/products/default.html

This review is for a previous version of the add-on (0.1.1-signed). 

If you have any suggestion to enhance the extension file a new bug here,
https://github.com/inbasic/iyccenter/issues