I decided to post on Security as it's more a privacy-oriented question. I could post it on Superuser as a browser question.
These days I am experiencing a strange behaviour with Firefox 92.0.1 equipped with
I Don't Care About Cookies and
Cookies AutoDelete plugins. The browser is configured to reject all third party cookies.
The idea is that IDCAC will accept any cookie banner, but the browser blocks 3rd party cookies in the first chance. And at the end of the session, CAD will drop all cookies from non-whitelisted sites.
I spend a lot of time on Github and StackExchange. And it is in my CAD whitelist so I don't log in to it every time.
Every while and then, CAD notifies me of clearing content from
arstechnica.com. Easy as spending one minute still on a page on Github or StackExchange and find the notification
CookieAutoDelete removed data from 2 domains, including addons.mozilla.org, arstechnica.com
CookieAutoDelete removed data from arstechnica.com
But it's not just Github. A number of web sites (even non-English newspapers) look like containing data from arstechnica.
I explored the network connections from Firefox but none is made to domain
I explored the source code of a Github page and no script or content from
arstechnica.com was hardcoded. Obviously, I can't tell about scripts hosted on Github,
Adblock blocks a number of trackers.
Looking at CAD log, looks like the cookie set by arstechnica is
I tried to search for it but it can't be found on github or other favourite websites
I also tried to open HPE iLO4 firmware administrator page of a physical server I own. Still, a popup from arstechnica.
CAD says to have cleaned:
- IndexedDB from arstechnica
- Service workers from arstechnica
- Cookie (
cneplayercount) from arstechnical "Because it's not in white or grey list"
I also checked for all of my extensions and after the three linked above, there is another open source extension
Offline QR code generator
I looked into
about:serviceworkers and none is active
What is going on? Why is CAD finding stuff from arstechnica everywhere? How can I investigate further?