Thanks for your feedback! By "not the original," do you mean that this version of AdBlock for Firefox isn't the same one that was in the Mozilla Add-ons Store a while back? That's true. When Firefox introduced its new Web Extensions API that required all add-ons to adapt or die, we rewrote AdBlock from the ground up. It's now faster and more importantly, complies with Mozilla's required standard.

If you're still seeing ads after installing AdBlock, we have some suggestions here: https://help.getadblock.com/solution/articles/6000061202-seeing-unblocked-ads-start-here-
Thanks!

Rhana, AdBlock Community Manager