Examine source code of Planets Blue

{
  "name": "Planets Blue",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "rgba(2, 5, 15, 1)",
      "tab_background_text": "rgba(237, 248, 255, 1)",
      "toolbar": "rgba(2, 5, 15, 0)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(2, 5, 15, 0.04)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(255, 255, 255, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{36074973-1a59-4d4e-a98e-a226a4f9ae6b}"
    }
  }
}