Examine source code of Lust for Rust

{
  "theme": {
    "images": {
      "theme_frame": "LustforRustHeaderb.jpg"
    },
    "colors": {
      "frame": "#74a8cf",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Lust for Rust",
  "manifest_version": 2,
  "description": "Lust for Rust features some old bolts from abandoned coal mining wagons. Rusting away on the wet West Coast of NZ."
}