Examine source code of 2 Simple Leaves

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#7ad13d",
      "tab_background_text": "#00520b"
    }
  },
  "version": "2.0",
  "name": "2 Simple Leaves",
  "manifest_version": 2,
  "description": "Here is a firefox theme that is created simply with only 2 leaves. Manipulated, sized, rotated, and placed into positions to make them look like a random photo of several leaves. Enjoy!"
}