Have been using Adblock Plus for years with no major complaints; I had forgotten how cluttered and awkward some websites are without it. The acceptable ads it occaisonally displays -- most websites I visit don't use display them -- are unintrusive and clearly identified as ads; hopefully all ads will eventually be like this. Only issue is that very infrequently, maybe once a month, I have to disable Adblock Plus because it is interfering with a page's functionality -- buttons not working, elements not displaying -- but I think that's more a problem with the page than the add-on. Overally, highly recommended if you're looking for a simple, functional, and safe ad-blocker that is helping to improve the web browsering experience by encouraging better ad design practices.