How can I permanently delete tracking cookies?

I was alarmed to read the series in the series in the Wall Street Journal ( www.wsj.com/wtk ) about flash cookies, trackers, and beacons. I had always set my preferences (in Firefox) to not accept cookies, changing that only when I came to a site that required cookies (like Facebook), but then choosing the option to not accept 3rd-party cookies, changing my preferences after the visit, and deleting cookies.
I installed the add-ons suggested by the WSJ and on this website (Adblock Plus, Better Privacy, Ghostery, PrivacyChoice TrackerWater, and Taco. There is nothing in my Library>Preferences>Macromedia file. I visited the Adobe website and followed their instructions to delete flash cookies. Yet I cannot get rid of the cookies!
I tried this experiment: when not connected to the internet, with cookies turned off, I deleted all cookies, closed Firefox, and lo and behold, 150 cookies (yes, I counted them) had re-created themselves!
How can I get rid of them permanently? Please don't give me any pablum about them being harmless, they help to streamline the ads being shown to me, etc. etc. I don't care about that. This is MY computer and I do not want anyone installing anything on it! It irks me that deleting cookies deletes the useful cookies -- cookies that I would chose to keep -- but keeps all these other ones.
Please, if anyone knows, how can I permanently delete these cookies?

Get the Add-on NoScript for Firefox.
http://noscript.net/
In addition, I always empty all cookies after a browsing session or at the end of the day. The worst is I have to log back in to some sites. You can't permanently eliminate the possibility of picking up a tracking cookie, but you can get rid of them if you pick one up. NoScript minimizes the chances of getting one, since you only allow the minimum scripts for a site to function. I suggest you start at the NS site and read about it. There's also a support forum which needs no registration. I won't have a lot of time today to explain much more.
Here what you do to completely eliminate Flash cookies. This works.
+"Delete your ~/Library/Preferences/Macromedia folder so you're starting from a clean, shared-object-free, slate.+
+Next, in your web browser visit http://www.macromedia.com/support/documentation/en/flashplayer/help/settings_man ager07.html and under the Global Privacy Settings, click the button labeled "always deny" then "confirm" to prevent Flash from watching you through your webcam or listening to you over the computer's microphone. Technically speaking this isn't necessary, but it seems like a prudent move if you don't like the idea of web sites accessing these resources. Don't bother changing anything else in the Settings Manager because the other stuff pretty much involves what and how much can get saved on your computer, and we're going to answer those questions entirely different means.+
+Now navigate in the Finder back to your ~/Library/Preferences/Macromedia folder and and recursively lock every file and folder inside it. This should include macromedia.com/support/flashplayer/sys/settings.sol, macromedia.com/support/flashplayer/sys, macromedia.com/support/flashplayer, macromedia.com/support, macromedia.com/#SharedObjects/<random letters and numbers>, macromedia.com/#SharedObjects, and finally the macromedia.com folder itself.+
+That's it!+
+The cool thing about this is that Flash is convinced it can store this crap so everything works, but nothing is actually remembered by Flash. Or at least nothing is remembered between browser sessions. Flash apparently never tells sites attempting to store stuff that, even though storing is enabled, it doesn't actually work and nothing gets stored."+

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