But I also like to know when people are trying to acquire it without asking it to me.
So is there any easy way to block and detect those tracking pixels, without blocking all images?
Something like :
When on bitcointalk domain, disable every content loading from other domains, except for the whitelisted ones, and put a visible red cross instead of said content, with a right-click option to whitelist the domain of this blocked content?
Block third-party cookies and images, maybe?
http://support.mozilla.org/en-US/kb/disable-third-party-cookies
http://kb.mozillazine.org/Permissions.default.image
More control may be had by using Adblock or NoScript and writing your own filters.