Examine source code of Protonfox

{
  "name": "Protonfox",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Screen Shot 2020-01-18 at 19.19.41.png"
    },
    "colors": {
      "frame": "rgba(38, 42, 51, 1)",
      "tab_background_text": "rgba(246, 247, 250, 1)",
      "toolbar": "rgba(60, 65, 78, 1)",
      "bookmark_text": "rgba(246, 247, 250, 1)",
      "toolbar_field": "rgba(27, 30, 36, 1)",
      "toolbar_field_text": "rgba(246, 247, 250, 1)"
    }
  }
}