Nothing more to say than what ashleedawg already wrote on March 28th 2019:
"WHO KNOWS what Mozilla was thinking when they took a step *backwards* in terms of empowering users to manage their own Security & Privacy by removing the ability to View Individual Cookies... but the up-side is that it caused me to discovered THIS add-in, which is *infinitely better* than Firefox's old built-in features.".
Fully agreed!