Blocking _all_ ads would surely make content providers revolt against Firefox to the point where its viability as a mainstream Web browser would be at risk.
Let's say the advertisers and websites do start giving grief to end users who are proactively protective. I have an idea that I believe can be done, but I'm at a loss with my current skill level to achieve it.
Quick anecdote: when Flash was a thing, I used to symlink .adobe and .macromedia to /dev/null to let the Flash cookies "think" they were being written to the HDD, while allowing me to view Flash content without worrying about the LSOs tracking me. I wonder if there is a way, if ads/websites figure out how to block adblockers, that would allow the "loading" of ads, but shunt them into /dev/null (or similar bit bucket) making the website think they have been loaded, but not. A man in the middle, as it were. If I could figure out how to begin this, I would undertake it as a project. Hosting this online and allowing others to pass their traffic through it would be ideal. MitM/proxy. Methinks it will eventually come to this if enough people continue to add blocking tools to their tool set.
Any ideas?