Like the reviewer VoxPop I too began to have issues with this extension - which I have used for several years - quite recently. It appears to be related to Firefox Sync as whitelisted domains disappear after I have used another PC upon returning to my main machine.

It has been an excellent, if occasionally labour intensive, addition to my online security but as of writing it frustrates as much as it protects.

Thanks for providing me this

Great, and easy to use.

Great JavaScript blocker that is easy to use and WORKS.

awsome