Examine source code of Profound Obscura

{
  "name": "Profound Obscura",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "solid-color-image.png"
    },
    "colors": {
      "frame": "rgba(43, 43, 43, 1)",
      "tab_background_text": "rgba(173, 170, 170, 1)",
      "toolbar": "rgba(28, 28, 28, 1)",
      "bookmark_text": "rgba(9, 167, 224, 1)",
      "toolbar_field": "rgba(74, 74, 74, 1)",
      "toolbar_field_text": "rgba(173, 170, 170, 1)",
      "tab_line": "rgba(9, 167, 224, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{bf141cd1-711e-4fb2-a77a-ce61de8003b0}"
    }
  }
}