Examine source code of Gentle Black by MaDonna

{
  "name": "Gentle Black by MaDonna",
  "manifest_version": 2,
  "version": "5.0",
  "theme": {
    "images": {
      "theme_frame": "GentleBlalck.jpg"
    },
    "colors": {
      "frame": "rgba(0, 0, 0, 1)",
      "tab_background_text": "rgba(187, 189, 185, 1)",
      "toolbar": "rgba(0, 0, 0, 0)",
      "bookmark_text": "rgba(187, 189, 185, 1)",
      "toolbar_field": "rgba(0, 0, 0, 0.09)",
      "toolbar_field_text": "rgba(187, 189, 185, 1)",
      "tab_line": "rgba(187, 189, 185, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9670c1cd-3fb9-4dec-aa2e-d394fd111127}"
    }
  }
}