Examine source code of Gone Green

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#e4f5d7",
      "tab_background_text": "#437820"
    }
  },
  "version": "2.0",
  "name": "Gone Green",
  "manifest_version": 2,
  "description": "A simple green theme with a stylized leaf up in the corner."
}