Crash Firefox 26 and don`t load. Rated 2 out of 5 stars

Crash Firefox 26 and don`t load. Во время установки на Firefox 26 Мозилла слетает и пишет об ошибке.

This review is for a previous version of the add-on (1.0.5.09.1-signed.1-signed.1-signed). 

fixed in 1.0.6.6

please, use 1.0.6.6 (http://hcalendar.googlecode.com/files/hcalendar1.0.6.6-fx%2Btb.xpi)