While cruising through my cookies I came across a couple I didn't recognize. Usually I merely delete them without examining what their content is. In these cases (inspectlet.com and onesignal.com — the provenance of which I haven't bothered to check, so I have no idea what websites I've visited might have set them) each had a single entry, namely _cfduid .
When I Googled that alone, the following comments showed up:
• The __cfduid cookie is used to override any security restrictions based on the IP address the visitor is coming from.
• The "__cfduid" cookie is set by the CloudFlare service to identify trusted web traffic. It does not correspond to any user id in the web ...
I'm not sure that such info clarifies the other comments and concerns in this thread, but from my perspective (and from the fact that such cookies are not 'persistent' for me on Firefox) they would appear to be simply trackers without other 'motivations'.
