Firefox versus AdSubtract: How Not to Compete with Open Source Have had AdSubtract working for years – and it has done me well. My web experience is totally different from peo,le who do not block ads. I am just unable to browse on other peoples machines if they don’t block ads. I have an ad phobia – can’t watch TV – hate billboards – arrive at the movies late to miss ads. I would make all ads illegal. We don’t need them! I am about to try some of the solutions mentioned in this article. Adsubtract has not been working well lately.