Depending on what additional ad blocking software you're using (ghostscript or noscript can cause problems with it, can't remember which), you might want to use Adblock Edge instead as it does not force you to have certain things greenlisted Google analytics being the most famous example (or has the mandatory greenlisting been done away with in the latest versions?)
I know that close to a year ago, at least, Mozilla sold out and caved to pressure from businesses to create greenlists for "non-intrusive ads" that could not be redlisted. Adblock Edge was then released to eliminate that problem. I have had zero problems with Edge.
Element-hiding helper allows you to highlight any element on the page and hide it-- you have to be careful however since blocking the wrong element, or too broad an element will block most of the page contents. One thing I used it for was to get rid of that "secured by bla bla" tab on the bottom right of RDNA that I always clicked on by mistake when trying to click on the lowermost right product on the page or screen.