Essential! Rated 4 out of 5 stars
I installed this add-on today, and it didn't take long for me to realize that this is what I've been looking for!
Adblock Plus is great for blocking stuff from known ad sites, but it is quite useless for integrated content. Well, with this add-on you will be able to block most annoying page sections. I find many sites I regularly visit are cluttered and slow-rendering with too much irrelevant stuff. Now I can easily block that, without using custom Greasemonkey scripts or whatever. Pages render quicker and you get the content you want.
Just one wish, often you block too much content. Then you REALLY need an UNDO block function, because it's a hassle to go through all blocks, trying to locate and delete the bad block! Should be relatively easy to fix.