Question

Firefox doesn't delete cookies on exit. When will it do?

Firefox fails to delete cookies if set to do so on quitting and if the settings 'General->Show my windows and tabs from last time' have been set.

The problem is described e.g. as bug 794253, 443354 and 401187:

https://bugzilla.mozilla.org/show_bug.cgi?id=794253 https://bugzilla.mozilla.org/show_bug.cgi?id=443354 https://bugzilla.mozilla.org/show_bug.cgi?id=401187 .

As a result user tracking through cookies can continue even if Firefox had been closed before. Moreover another user could resume an earlier session and access pages an earlier user had not logged off from.

A work around is also described in https://bugzilla.mozilla.org/show_bug.cgi?id=443354 :
edit direct link to comment -J99 bug 443354 c48

In about:config set browser.sessionstore.privacy_level & browser.sessionstore.privacy_level_deferred to 1 or 2 as described with the bug report.

However, as a general solution this problem needs to be fixed in Firefox since most people will neither be aware of the problem nor of the work around.

Users can vote for this bug in Bugzilla to promote its solution.

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