Examine source code of Dark gray FF logo colors

{
  "name": "Dark gray FF logo colors",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "128px-Firefox_brand_logo,_2019.png"
    },
    "colors": {
      "frame": "rgba(255, 255, 255, 1)",
      "tab_background_text": "rgba(255, 168, 73, 0.2)",
      "toolbar": "rgba(3, 3, 3, 0)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(127, 96, 253, 0.3)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(217, 39, 84, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c146b512-c608-4127-94be-3fd6e1b51887}"
    }
  }
}