Rated 5 out of 5 stars

Works flawlessly as far as I'm concerned. I keep long text files of the sites I want to block, for easy input into different Firefoxes on different computers.

For even better self-discipline, it's too bad it doesn't also block Internet Explorer (but that's hardly the developer's fault, lol) but really, because IE is such a crappy browser, you soon stop trying to circumvent Leechblock's restrictions in this asinine manner.

This review is for a previous version of the add-on (0.4.2.2).