[swebs]

In Firefox you can just install the uMatrix extension. It not only allows you to block cookies, but also javascript, frames, and images. You can choose to block only third party elements, third party elements from known tracking/ad agencies, or even first party elements.

[daphneokeefe]

In Chrome, you can also use uBlock Origin, which is potentially a little easier to use if you're not an advanced user.

https://chrome.google.com/webstore/detail/ublock-origin/cjpa...

[JackCh]

For what it's worth I found uMatrix easier to use than uBlock Origin's "Advanced user" mode. Both took a few minutes to get a hang of since neither have particularly discoverable interfaces, but I find the uMatrix interface just a lot faster to use once I knew both.

[rch]

I should have to install a plugin if I want to see targeted ads, not the other way around.