AdBlock blocked? Rated 5 out of 5 stars

Every time I start FireFox, AdBlock is there in name only: Options gives a blank page & ads are all over the place. I have to install it again & it works fine - until I start FireFox next time, when it's disappeared agaiin!

This review is for a previous version of the add-on (2.1.2.1-signed).  This user has 2 previous reviews of this add-on.