MV3 doesn’t allow extensions to know what requests are being made, so extensions can’t use your data maliciously.
Requests to ads that are blocked are blocked.
I think you’re thinking of Privacy-preserving ad measurement which is an option in Firefox and Safari. https://support.mozilla.org/en-US/kb/privacy-preserving-attr...
Which is something we know for a fact uBlock Origin doesn't do. It's open source, you can check the code yourself. MV3, on the other hand, doesn't do much to assure me that an addon isn't phoning home. Why not just give the user to ability to block network requests on a per-addon basis? Too difficult a task for the trillion dollar company? Or could it be that forcing users to switch to MV3 addons isn't about safety at all?
Now, if an ad blocker has webRequest permissions it’s a red flag.
For example https://developer.chrome.com/docs/extensions/develop/concept... uses webRequest to send telemetry back to some remote server.
With Manifest v3, let's say I'm an ad blocker and I want to get access to metrics not to violate privacy, but just to report them to the user (X domains blocked, Y out of Z requests blocked, etc). How would I get access to those metrics?
Otherwise, you can’t really without more invasive permissions.
https://stackoverflow.com/questions/74813523/chrome-extensio...