Examine source code of Dune grass

{
  "name": "Dune grass",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "dune g 2021.jpg"
    },
    "colors": {
      "frame": "rgba(255, 253, 246, 1)",
      "tab_background_text": "rgb(255, 253, 246)",
      "bookmark_text": "rgb(0, 0, 0)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(140, 124, 53)",
      "tab_line": "rgb(0, 0, 0)"
    }
  }
}