I was there too, in the 1.0 days, and still am. But these days are gone, Firefox is not coming back. Back then Firefox was immensely better than IE. As long as the other alternatives are just as good, there is no reason for the mythical "average user" to change over. Why bother if you can do everything in Chrome? We may understand the differences, ideological or technical, but good luck explaining that out there. There's a massive disconnect between user and technology and as a result people will live in the perfectly curated technological bubble that's been served to them.
the adblock "endgame" will be a self-hosted DNS system that blocks requests to ad-server urls (or return benign responses).
Then the game will switch to encrypted proxied traffic that you cannot block.
Then the adblocking software will switch to the GPU layer, and use machine learning and AI to wipe the region of memory in the GPU containing the ads (and replace it with something benign).
Then the next logical step from likes of google is a fully trusted computing environment - aka, you as an end user no longer control your own machine.
The browser... or the javascript running in it, served from the primary domain you are browsing will just do DNS over HTTP from within the browser, completely avoiding your dns filter
