Examine source code of Cetus (improved)

{
  "name": "Cetus (improved)",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "cetus.png"
    },
    "colors": {
      "frame": "rgba(49, 219, 253, 1)",
      "tab_background_text": "rgba(2, 120, 220, 1)",
      "toolbar": "rgba(90, 105, 169, 1)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(255, 255, 255, 1)",
      "toolbar_field_text": "rgba(85, 106, 176, 1)",
      "tab_line": "rgba(56, 60, 125, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d1a0f8f2-3358-4bfc-ba6b-6e3615077d34}"
    }
  }
}