Cookies are permanantly stored even in Private Browsing

This is at least the second time I noticed this problem. Unfortunately the problem is elusive and I don't know how to reproduce it. Here is what happened:
I use "always use private browsing mode". I have "Accept cookies from site" enabled so that I don't have to adjust the setting every time I need to log on to a site.
According to the documentation, under PB, all cookies are session cookies and should be removed when I close firefox. But today I happened to have clicked "Show cookies" and was surprised to see a long list of cookies. Just to be clear, they were cookies from sites I visit and recognize, like google and amazon, and not any potentially malicious site. But the thing is, they shouldn't be there. I closed and then restarted firefox, but the cookies were still there. And they were not only from the sites I visited today, but also yesterday and maybe earlier. I completely shut down (not hibernate) my computer each day, so it is impossible that this was because a firefox process running unnoticed.
I clearly remember the last time this happened, probably a few weeks ago, I suspected that the cookies were left over from before I started using "always use PB" half a year ago. So I returned to normal mode and cleared all the cookies, and re-enabled "always use PB". So it is also impossible that these cookies I saw today were from the past.
I have firefox 33.0.2. on windows. Checked with Sysinternals Process Explorer, and all modules and signed and verified. I have very few processed running and I know each of them as I know the back of my hand. I have kept my system minimal and very stable over the years and all new applications are run on virtual machines. So I can rule out possibilities of viruses and the like.
I don't have any backup software except Systems Restore that comes with windows.
There was an update to firefox yesterday. Not sure if it is relevant. But I am sure I had at most two tabs open when the updated was installed, so it is hard to attribute all the cookies to some glitch during the update that somehow made the cookies permanent. I also checked Systems Restore and no restore points were made in the last three days.
Anyway, just trying to see if anyone has any similar experience. And if you use PB and always trust firefox to clear the cookies at the end of each session, start checking once in a while to see if you also have this issue.

Two initial thoughts:
(1) If you look at the cookie names and content in the View Cookies dialog, are they the ordinary scramble of different names and values, or do they look like "opt-out" cookies? Some security software or add-ons may restore opt-out cookies after you clear them.
(2) If you have any extensions that make requests to those sites, it's possible they are bypassing private browsing mode, although I would hope not. Hmmm.
Unfortunately, unlike history where you can see the time that an entry was added, it is difficult to figure out when a cookie was set. But there are many cookie add-ons that might provide insight.
Alternately, you could go directly to the cookies.sqlite database using the SQLite Manager extension. This is on the nerdy side, but manageable.
(1) Install SQLite Manager from: https://addons.mozilla.org/firefox/addon/sqlite-manager/
(2) The extension adds an item to the Tools menu. If you do not normally use the classic menu bar, tap the Alt key to display it temporarily or press Alt+t to pull down the Tools menu.
SQLite Manager may suggest a particular database, particularly on your second and later uses. You can skip that and it will open a new window.
(3) On the toolbar (first screen shot), choose the cookies.sqlite database and click Go. This should display the database entries for all your cookies (second screen shot).
(4) Select the following SQL query text:
SELECT host AS Site, datetime(creationTime/1000000,'unixepoch') AS Created, datetime(expiry,'unixepoch') AS Expires
FROM moz_cookies
ORDER BY creationTime, host
(5) Click the Execute SQL tab, paste the query, then click Run SQL. You should get a list of sites in order by the date their cookies were set (third screen shot).
Are the dates all fresh? If they are older, something may be rolling back your cookie clearing.

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