Adblock Plus does indeed not show up in the results on Mozilla.org curiously, but if you know how to find it, it's still there. Or you can just go to adblockplus.org and get the latest right from the source.
AdBlock Plus is still working for me however. I'm guessing the people who claim it stopped working are visiting sites that have recently taken measures to try and circumvent AdBlock Plus. There is likely some non-sinister and utterly boring reason why it's not showing up in search results however. NoScript is far more of a threat to advertisers than AdBlock Plus anyway. It gets rid of all those analytics scripts and other methods used to scrape a lot of invasive data from your browser.