Examine source code of First-Theme777

{
  "name": "Red And yellow",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Wallpaper 30.jpg"
    },
    "colors": {
      "frame": "rgba(229, 230, 232, 1)",
      "tab_background_text": "rgba(60, 255, 0, 1)",
      "toolbar": "rgba(250, 0, 0, 1)",
      "bookmark_text": "rgba(60, 255, 0, 1)",
      "toolbar_field_text": "rgba(60, 255, 0, 1)",
      "tab_line": "rgba(60, 255, 0, 1)"
    }
  }
}