Every ad blocker gets full and complete access to all your data. It needs that kind of access in order to … tada … remove ads. It’s really simple: ads are on all websites, so an ad blocker needs access to all websites.
You probably mean that Adblock Plus abuses this access? Surely this is something you have proof for? Here you can see an example of how this kind of thing looks like: https://palant.info/2023/06/05/introducing-pcvark-and-their-.... You can look around in my blog, there is more.
It has been a while since I’ve been involved with Adblock Plus. I sincerely doubt however that ABP’s privacy stance changed that much since I’ve left. But I’ll wait for you to find proof for your claims.
Except uBlock Origin Lite¹ which is permission-less.
¹) https://addons.mozilla.org/en-US/firefox/addon/ublock-origin...
I'm sympathetic to wanting to limit data access to things. But this data seems to already be available to the browser? Having a separate process to manage that seems somewhat natural?