Blocking cookies with Tools Options Privacy Exceptions doesn't work on some sites, why?

I have Firefox 3.6.9 (on XP pro) set to '''ask me every time''' and '''block third-party cookies'''. Despite this I noticed that both ''live.com'' and ''yahoo.com'' (neither of which I visit directly) were able to leave persistent cookies. Having noticed this I '''blocked''' both sites using the method in the header. This did not work.
I only managed to block them by visiting the sites and using '''Page Info > Permissions'''.
It would be nice to know why this can happen. Thank you.

Thanks for that cor-el. I haven't got any cookie related extensions enabled, and it happened in Safe Mode.
I haven't got the problem any more as I explained, I really wanted to know why an apparently blocked third party site was able to bypass the block.

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Blocking cookies with Tools Options Privacy Exceptions doesn't work on some sites, why?

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