Examine source code of SeaMonkey Modern LW

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#c7d0d9",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "SeaMonkey Modern LW",
  "manifest_version": 2,
  "description": "My poor attempt to clone the original SeaMonkey Modern theme."
}