Here are my privacy settings again. My formatting in the original question did not hold:

Use custom settings for history

Always use private browsing mode - unchecked

Remember my browsing and download history - checked

Remember search and form history - checked

Accept cookies from sites - checked

Accept third-party cookies - unchecked

Keep until: I close Firefox

Clear history when Firefox closes - checked

The 'Exceptions' submenu has several domains set to "Allow" - these are the cookies I would like Firefox to keep on exit.

Settings for clearing History - In this submenu, 'Cookies' is unchecked. While this is unchecked, Firefox will not delete any cookies on exit, even though I have the 'Keep until I close Firefox" option enabled. But if I check this box, Firefox deletes all cookies on exit and ignores my Allowed Exceptions. This seeems to make no sense to me.

Hello flang, see : about:permissions - What permissions can I manage?

thank you

Thank you for your help. I think the issue is resolved. I believe I was confused as to which cookies were being saved, and which were not.

Let all cookies expire when you close Firefox.

• Firefox/Tools > Options > Privacy > Cookies: Keep until: I close Firefox

Create an Allow exception for cookies that you want to keep.

• Firefox/Tools > Options > Privacy > Cookies: Exceptions

In case you are using "Clear history when Firefox closes":

• do not clear Cookies
• do not clear Site Preferences

• Tools > Options > Privacy > Cookies > Firefox will: "Use custom settings for history": [X] "Clear history when Firefox closes" > Settings
• https://support.mozilla.org/kb/Clear+Recent+History

Note that clearing "Site Preferences" clears all exceptions for cookies, images, pop-up windows, software installation, and passwords.

Clearing cookies will remove all specified (selected) cookies including cookies that have an allow exception and cookies from plugins.

I have the same issue. I have set up permissions manager to keep cookies I want for some sites. It appears saved in Permissions Manager but does not perform the function. I still have to get security codes for quite a few sites that are texted, a charge every time I want to enter the site.

Wait, am I missing something here! These proposed solutions do not work or at least not for me.

The "Exceptions" list only work for accepting or blocking the cookie when the site tries to store at at first, and Firefox doesn't use that list to determine which cookie to keep before it deletes all of them as it closes.

Setting the cookie life as "Allow for Session" from permissions page is the same as "Keep until I close Firefox", and they will simply delete ALL the cookie even for the sites that I have in the "Exceptions".

Again "Exceptions" only work if you block cookies by default for all but you want to allow some sites and not to whether keep or delete the cookie when closing firefox. The only way I found to do what the question asks is to use Add-ons (like Self-Destructing Cookies *does not work as expected too*) but until now (v24) Firefox cannot do it by itself.

With these settings you should be able to keep cookies from a specific domain.
If not then some extension might be interfering.

Let all cookies expire when you close Firefox.

• Firefox/Tools > Options > Privacy > Cookies: Keep until: I close Firefox

Create a cookie 'allow' exception for cookies that you want to keep.

• Firefox/Tools > Options > Privacy > Cookies: Exceptions

Make sure that you do not run Firefox in (permanent) Private Browsing mode (Never Remember History).
In Private Browsing mode all cookies are session cookies that expire automatically.

• https://support.mozilla.org/kb/Private+Browsing

Be cautious with using "Clear history when Firefox closes" or clearing cookies otherwise.

If clearing cookies doesn't work then it is possible that the cookies.sqlite file that stores the cookies is corrupted.

Rename (or delete) cookies.sqlite (cookies.sqlite.old) and delete other present cookie files like cookies.sqlite-journal in the Firefox profile folder in case the file cookies.sqlite got corrupted.