Can't find UnZIP on my computer Assegnate 1 su 5 stelle

where the heck do I find this on my computer???

Assegnate 3 su 5 stelle

Installed it and tried to open a zip file. A pop up comes up asking whether I want to reveal it. I say yes, but then nothing happens...
I use firefow 20,0,1 Windows 7 from 2009

Promises, promises... but things are going to be allright Assegnate 5 su 5 stelle

If the developer of this add-on makes true his promise to make an even more user friendly 'Unzip' & makes it possible to unzip really large files... Then I promise to develop 'Zip'.
I see a bright future with unlimited Zip and Unzip of countless files, big and small, all within Firefox. Highly recommended.

Questa recensione riguarda una versione precedente (0.07.63.1-signed) del componente aggiuntivo. 

Merci but what do you mean by 'Then I promise to develop 'Zip''? Are you developer?