Examine source code of Olivine Wash

{
  "theme": {
    "images": {
      "theme_frame": "olivine_wash_header.jpg"
    },
    "colors": {
      "frame": "#333333",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Olivine Wash",
  "manifest_version": 2,
  "description": "A very gentle green-based gradient, Olivine Wash is designed to compliment a green-based theme while remaining very neutral. There's just enough gradient to give the browser some class without distracting from the buttons, or overtaking your existing theme."
}