Examine source code of FF Navy Black

{
  "manifest_version": 2,
  "version": "1.1",
  "name": "FF Navy Dark",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(26, 53, 91)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(21, 39, 56)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgba(255, 255, 255, 0)",
      "popup": "rgb(20, 41, 63)",
      "popup_text": "rgb(255, 255, 255)",
      "ntp_background": "rgb(4, 8, 13)",
      "popup_border": "rgba(11, 18, 25, 0)",
      "popup_highlight": "rgba(13, 131, 248, 0.63)",
      "tab_loading": "rgba(255, 255, 255, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{20a6587b-93ce-4570-b5bd-e811cbc873f9}"
    }
  }
}