Self-destructing cookies not working?

[ghost]

Firefox 52.0
macOS 10.12.3
Self-Destructing Cookies 0.4.11

"Grace period" for cookie deletion is set to 1 second after the tab is closed. Worked perfectly on a clean new Firefox profile.
Some settings in user.js seem to override this, cookies are only deleted after closing Firefox.

Any ideas?

[Atavic]

Network.cookie.lifetimePolicy is 2, but here is said

Self-Destructing Cookies Configuration:
Keep network.cookie.lifetimePolicy = 0

[ghost]

Keep network.cookie.lifetimePolicy = 0

Thanks! Unfortunately, that didn't work.
Even tried this on a clean new profile with only user.js and SDC-Addon installed, still nothing. Strange.

[Atavic]

user_pref("network.cookie.thirdparty.sessionOnly", true); try reverting this one also.

[ghost]

Still the same.

I just noticed that the SDC Icon in the top right corner completely disappears, you cant even get it back via the "3 stripes" button.
Same goes for the menu entries under "Tools".

[Thorin-Oakenpants]

Are you using FPI? No, its not set by this user.js, but I'm asking. Because FP isolation will break CSP (and other cookie controlling addons, and cache and storage access)

check privacy.firstparty.isolate -> false

Also, this js will open in PB mode. I have no idea what PB mode does to override cookie settings (i think all it does is enforce session only). Does SDC cookies work if you open>normal window from the menu?

EDIT:

• Have you tested this is a vanilla default FF. First test SDC works (don't add any other add-ons) - check "Worked perfectly on a clean new Firefox profile."
• Then add the user.js and re-test.

So just to clarify, the only settings changed are those done by this repo's user.js?

[ghost]

check privacy.firstparty.isolate -> false

It is set to false, yes.

So just to clarify, the only settings changed are those done by this repo's user.js?

I made a clean new profile, only added SDC. Cookie deletion works perfectly. Closed Firefox, added user.js, opened Firefox -> doesn't work anymore + SDC icons are gone.

Also, this js will open in PB mode. I have no idea what PB mode does to override cookie settings (i think all it does is enforce session only). Does SDC cookies work if you open>normal window from the menu?

This seems to be the issue! Thanks!
When I turn off PB on autostart inside user.js (browser.privatebrowsing.autostart -> false) SDC works again and the icons are there again, too.

So Private Browsing Mode does seem to break Self-Destructing Cookies.
Should I report this to the dev of the addon? Or do you think he is aware of that?

EDIT:
Dev is aware of the issue. He can do nothing about it, according to this.

[Atavic]

Cookies aren't saved in Private Browsing, so there are none to be destroyed. All Session Cookies are deleted when exiting Private Browsing Mode.

[nodiscc]

@Atavic the second part is correct "All Session Cookies are deleted when exiting Private Browsing Mode".

The first part is not ("Cookies aren't saved in Private Browsing"). Firefox maintains a private cookie jar (first-party only as per user.js settings). As stated in SDC's FAQ the addon is unable to access this cookie jar, hence SDC does not work in Private Browsing.

If you want SDC to be able to do what it's designed for (delete cookies after a set amount of time after closing a site's tabs), you have to disable private browsing