Examine source code of Relaxingred gradient

{
  "name": "Relaxingred",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Relaxingred.png"
    },
    "colors": {
      "frame": "rgba(178, 10, 44, 1)",
      "tab_background_text": "rgba(255, 251, 213, 1)",
      "toolbar": "rgba(255, 53, 79, 1)",
      "bookmark_text": "rgba(255, 251, 213, 1)",
      "toolbar_field": "rgba(178, 10, 44, 0)",
      "toolbar_field_text": "rgba(255, 251, 213, 1)",
      "tab_line": "rgba(255, 251, 213, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6e5e23d7-a088-4975-8dc0-1b8e0b196f46}"
    }
  }
}