Exactly what I wanted.

Easy to use. Very good add-ons.

The best Cookie Editor for Firefox Quantum. Simple, clean minimal interface. Works on mobile too, just perfect.

This extension works great on Firefox mobile. Highly intuitive and we'll made

Simple, straight-forward, and does what it says should.

Could acutally import things

Nice, thank you very much. Just what I need.

A cookie editor that works for Firefox 57+ and with locally opened files (file:/// URLs).

What works:
* It displays the page's cookies and their values (so see other page's cookies, got to the other page's tab), in a popup when the add-on icon is clicked.
* Deleting individual cookies works.

What does not work:
* Creating individual cookies does not work, at least not for file URLs.
* Changing values did not work, at least not for file URLs.

Fait le job