I regularly get the wrong favicon in specific sites, for example ars technica favicon in reddit

"Tales of Favicons and Caches: Persistent Tracking in Modern Browsers"

https://news.ycombinator.com/item?id=25868742

53 comments on 22-jan-2021

Definitely something I don't want. Maybe I should just remove the favorites or maybe I can save them as redirects or HTML or something.

Note I use private windows most often & shoutout Little Snitch for driving the discovery.

https://news.ycombinator.com/item?id=26051370

it gave me some ID, but how do I test that some different website can track me resulting in same ID?

or is it only "detect private browsing/container on same browser" kind of stuff?

Can containerize for the less paranoid and less work but browsers touching host kernel gives me the ick as does the idea of trying to write ebpf policies for firefox to mitigate. Browsers are pain.