Examine source code of Muted

{
  "name": "Muted",
  "manifest_version": 2,
  "version": "6.0",
  "theme": {
    "images": {
      "theme_frame": "16x16.png"
    },
    "colors": {
      "frame": "rgba(113, 93, 128, 1)",
      "tab_background_text": "rgba(158, 158, 158, 1)",
      "toolbar": "rgba(86, 145, 148, 1)",
      "bookmark_text": "rgba(207, 207, 207, 1)",
      "toolbar_field": "rgba(103, 81, 120, 1)",
      "toolbar_field_text": "rgba(148, 148, 148, 1)",
      "tab_line": "rgba(255, 255, 255, 0)"
    }
  }
}