This was a conscious decision. See bug 117707 for the reasoning.
To demonstrate the problem w/ this, you can look at: http://www.mozilla.org/quality/networking/testing/cookies/jscookietest.html Turning off each preference one-by-one, as well as together, you can see how the results of each test are inconclusive, because error conditions and null cookies are indistinguishable. I'm started to look at other browsers, and they don't seem to have a similar feature, so they don't have this problem.
The dom.disable_cookie* prefs are removed from the tree now, so this bug is obsolete.
Status: NEW → RESOLVED
Last Resolved: 15 years ago
Resolution: --- → INVALID
Status: RESOLVED → VERIFIED
QA Contact: cookieqa → benc
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