Changing an icon to a PNG help

[xJus10x]

Hey I'm wanting to change my default firefox icon to one I downloaded from Deviant art, but when I try to copy and paste the icon it just shows the logo for a PNG, not the image I want. Anyone know how to fix this, thanks.

 

[Ti_Poussin]

Use graphic converter to generate the .icns
1- locate the firefox appz in your applications folder
2- right click on it
3- show packages contents
4- Browse the Contents/Ressources/
5- Save the .icns somewhere save
6- Put your .icns images there

N.B.: The appz icon (.icns) require many template, open one into the preview appz to see all require size and style require. Make a similar one.

That should do the trick.

 

[xJus10x]

I guess my question is how do I convert the png to an icnz file. Thanks.