Examine source code of Darkly Pink Gradient

{
  "name": "Darkly Pink Gradient",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "firefox_pink_header_large.jpg"
    },
    "colors": {
      "frame": "rgba(48, 45, 47, 1)",
      "tab_background_text": "rgba(48, 45, 47, 1)",
      "toolbar": "rgba(48, 45, 47, 1)",
      "bookmark_text": "rgba(204, 166, 196, 1)",
      "toolbar_field": "rgba(204, 166, 196, 1)",
      "toolbar_field_text": "rgba(0, 0, 0, 1)",
      "tab_line": "rgba(204, 166, 196, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{aadcc942-bdcb-4d7c-a649-01495be42122}"
    }
  }
}