Firefox blocking cookie detection & deletion

[godtreep]

I recently read an article from Mozilla  << In some browsers, each cookie is a small file, but in Firefox, all cookies are stored in a single file, located in the Firefox profile folder >>  https://support.mozilla.org/en-US/kb/cookies-information-websites-store-on-your-computer

[nukecad]

I think that may be an older article.

In Windows Firefox cookies/supercookies are now actually stored in 4 files in your user profile.

In %Userprofile%\AppData\Roaming\Mozilla\Firefox\Profiles\{profilename}\ there are:
cookies.sqlite
webappsstore.sqlite
SiteSecurityServiceState.txt

In %Userprofile%\AppData\Local\....etc. there is:
index.sqlite

There are also other files saved in your user profile (either local or roaming) for the Firefox session, cache, jumplist, activity stream, and old/submitted crash reports.
(I've written my own cleaning routine to delete all of these).
I won't give them all on the open forum as that might upset Piriform, but once you know they are there it's easy enough to find them by name.