Examine source code of Indie Flat

{
  "name": "Indie Flat",
  "manifest_version": 2,
  "version": "6.0",
  "theme": {
    "images": {
      "theme_frame": "icon.svg"
    },
    "colors": {
      "frame": "rgba(29, 32, 33, 1)",
      "tab_background_text": "rgba(213, 196, 161, 1)",
      "toolbar": "rgba(87, 79, 74, 1)",
      "bookmark_text": "rgba(213, 196, 161, 1)",
      "toolbar_field": "rgba(29, 32, 33, 1)",
      "toolbar_field_text": "rgba(213, 196, 161, 1)",
      "tab_line": "rgba(213, 196, 161, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6bab3bcf-a25b-4dab-9a3a-1bea37ce75e9}"
    }
  }
}