Reset options Rated 4 out of 5 stars

I find this very useful - however, when it updated today it seems to have reset all my options to the defaults?

This review is for a previous version of the add-on (0.6.0.1-signed). 

Yes that was expected I mentioned in the developer comments that you need to redo your prefixes and suffixes for version 0.6.0.
I changed the names of the preferences to be inline with the Mozilla naming convention but this does mean that you will need to re-enter your customizations for the prefixes and suffixes. Sorry for the inconvenience.