Cookie Manager Alternatives

Cookie Manager

This Cookie Manager allows you to quickly view and edit specific cookies.
By default, the Cookie Manager opens when the extension starts up. This allows you to keep the extension disabled until you need it.

You can also turn off the automatic opening, and manually open the cookie manager by clicking on the extension button in the toolbar (desktop) or the Cookie Manager menu item (Firefox for Android 55+).

Features

Viewing all cookies
Querying cookies by any combination of url, domain, path, cookie content (name/value), httpOnly/secure/session flags, expiration time range.
Recognizes cookie jars (default, private browsing mode, container tabs aka userContext).
Allows you to remove individual cookies, or all matching cookies with one click.
Supports Firefox for Android (Fennec)
Supports the TOR Browser
Add cookies
Edit cookies (=add cookie, click the "Copy last selected cookie" button and save the changes)

Firefox add-on at https://addons.mozilla.org/en-US/firefox/addon/a-cookie-manager/