Hi riplongley, I don't know how to explain 5 cookies for one or more sites that do not have a displayable host name (e.g., example.com). Perhaps there is a bug in the Manage Site Data dialog that can't handle certain host names.

I wonder whether any of the cookie management extensions could provide more information about the site(s), or whether we might need to suggest how to query the cookies.sqlite database directly.

Did you want to look at extensions? https://addons.mozilla.org/firefox/search/?q=cookies&type=extension

Note that the data manager is this window:

• chrome://browser/content/preferences/siteDataSettings.xul

Involved JavaScript:

• chrome://browser/content/preferences/siteDataSettings.js

I can access this window and each of the lines in the Browser Toolbox, but that probably isn't of much help.

• https://dxr.mozilla.org/mozilla-release/source/browser/components/preferences/siteDataSettings.js
• https://dxr.mozilla.org/mozilla-release/source/browser/modules/SiteDataManager.jsm

SiteDataManager.getSites().then(sites => {this._sites = sites; ....}

_removeCookies(site) {
 for (let cookie of site.cookies) {
  Services.cookies.remove(
   cookie.host, cookie.name, cookie.path, false, cookie.originAttributes);
  }
  site.cookies = [];
},