Examine source code of Professional Color

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Professional Color",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(12, 12, 13)",
      "toolbar_text": "rgb(54, 220, 245)",
      "frame": "rgb(12, 12, 13)",
      "tab_background_text": "rgb(107, 107, 117)",
      "toolbar_field": "rgb(17, 43, 0)",
      "toolbar_field_text": "rgb(99, 255, 0)",
      "tab_line": "rgb(1, 7, 7)",
      "popup": "rgb(12, 12, 19)",
      "popup_text": "rgb(198, 198, 221)",
      "icons_attention": "rgb(197, 249, 4)",
      "popup_highlight_text": "rgb(99, 255, 0)",
      "popup_highlight": "rgb(32, 79, 0)",
      "tab_selected": "rgb(23, 23, 21)",
      "tab_text": "rgb(163, 223, 248)",
      "toolbar_bottom_separator": "rgb(25, 25, 28)",
      "toolbar_field_border": "rgb(3, 3, 3)",
      "toolbar_field_highlight_text": "rgb(6, 6, 6)",
      "toolbar_field_highlight": "rgb(99, 255, 0)",
      "toolbar_top_separator": "rgb(23, 23, 23)",
      "tab_loading": "rgb(1, 7, 7)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f9752735-fe79-4c2e-ab4e-f872d8ef6c40}"
    }
  }
}