Security Issues Addressed? Rated 3 out of 5 stars

I have security/privacy add-ons installed (only the usuals: no script, no referral, no click through/cross scripting), and this add-on has broken my firefox every time I have installed it. Totally. Requiring fresh reinstall and fresh reinstall of all add-ons (less Sage). Seems to install OK without the security/privacy add-ons, but not an option I am attracted to.

And seems to work for a lot of other people giving positive reviews.

Can you confirm the earlier security issues relating to potential hijacking (found through googling when trying to work out my problem) have been addressed please? Thanks.

This review is for a previous version of the add-on (1.4.12.1-signed). 

Yes, all known security issues have been addressed for some time now.