Rated 4 out of 5 stars
I have the occasional issue adding new words to block, and I wish there were some 'pre-made' lists that you could start from and add or remove your own words from there, but generally speaking, I think Pop Block is a pretty helpful add-on for internet junkies that could care less about current pop culture and entertainment news.
Blocking the words themselves doesn't change all that much, but for me it makes a large enough visual difference on any webpage that I don't even have to skim the article to know if it's something I care to read or not. Makes headline pages much easier to sift through as well as those 'required' friends' posts on facebook and the like.
I can see how some people would have a problem having to sign in through Facebook or Twitter (although, they've added 'sign up with e-mail option), but personally this is one add-on that I don't mind sharing about with friends.
I also see practical applications for parents who allow their children to use the internet on their own, or even supervised, as there are plenty of words (non-pop-culuture related) that I, as a parent, wouldn't want children seeing.