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Both IE and Firefox allow you to block third-party cookies. In Firefox the option this option is under Privacy tab in Options dialog.
IE browser allows users to set up an exceptions. For example I can block all third-party cookies except for

Is there a way to create the same exception in Firefox?

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In later versions of Firefox first select option "Use custom settings for history" in the dropdown for "Firefox will:" to be able to set third-party cookies options. – Peter Mortensen Oct 27 '10 at 12:02
up vote 3 down vote accepted

I use the extension CookieSafe:

This extension will allow you to easily control cookie permissions. It will appear on your statusbar. Just click on the icon to allow, block, or temporarily allow the site to set cookies. You can also view or clear the cookies and exceptions by...

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I installed CookieSafe but unfortunately it didn't give me control of third-party cookies I'd like to have. Thanks you for this idea it definitely was worth to try. – Vadim Sep 12 '09 at 21:16
@Vadim, did you notice that you can click-right and also left-click on the icon, giving different menus? It would surprise me to find that there's anything at all that CookieSafe can't do ... – harrymc Sep 13 '09 at 7:21
Thanks. It does works for me. – Vadim Sep 13 '09 at 14:34

You can put your site under the Exception button and it should work. I have done a similar thing and it's working for me.

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This works without installing anything. Not to mention that the extension mentioned above is still not available for FF4 – yhager Mar 18 '11 at 16:42
Nowadays you can just use the built-in controls to block all third party cookies, but allow some under Privacy -> History/Cookies -> Exceptions. – Timm Apr 4 '13 at 13:16

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