Okay, I'll bite.
I believe ads can exist if I consent to being shown them BEFOREHAND and alternatives, such as paying to opt-out completely are offered. The world is vast and changing with increasing velocity. I cannot keep up with all the possible tech products and services coming out even if I had a theoretically perfect RSS feed combined with other follows/subscriptions to content feeds. If a product is commercially successful to the point where they can afford to throw dollars at a probability of acquiring a new user, there's no fundamental reason why that behavior is necessarily bad/unwelcome. If I visit a news website, I want to be presented (before assaulted with ads) with a notice that provides me the option of paying for the content or seeing ads. Off the top of my head, spiegel.de follows this paradigm. A level further, and within reason for a downloaded/heavily-used/customizable software such as web browser is the opportunity to see ads that are relevant to my interests by affording me the option of indicating my interests to the platform before ads are shown and the ability to easily discriminate arbitrarily against a specific ad or categories related to any ad I don't like for any reason. If I don't like the ads a company shows me, even on the free version, they should not be repeated. If I don't want any category of ads that must be fine, but they company may opt to place a generic request for support of their corporation a-la-wikipedia funding request-- I am using their software for free, after all...
But to say there isn't exploring the full range of UX that can be afforded by modern software systems.
I say this as someone who is deeply disturbed by this latest update and will stop recommending FF as an alternative to chrome with superior privacy settings. Your reply just struck me as horribly defeatist. Ads are not leaving the web, but they _can_ be served with far better motives than they are currently.