Comment 1 for bug 1723269

I can't reproduce this.

It would appear that one of the PNG files used as template icons has a cHRM chunk (which defines the whitepoint for colour management) doesn't match the sRGB profile of your monitor. This is all about colour management, and as long as you're not trying to match some Pantone swatch to your screen you can ignore it.

(You could try using Photoshop or GIMP to update your monitor colour profile.)