Examine source code of Nord (contrast)

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Nord contrast",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(76, 86, 106)",
      "toolbar_text": "rgb(248, 249, 250)",
      "frame": "rgb(59, 66, 82)",
      "tab_background_text": "rgb(241, 243, 245)",
      "toolbar_field": "rgb(59, 66, 82)",
      "toolbar_field_text": "rgb(248, 249, 250)",
      "tab_line": "rgb(129, 161, 193)",
      "popup": "rgb(59, 66, 82)",
      "popup_text": "rgb(248, 249, 250)",
      "button_background_active": "rgb(94, 129, 172)",
      "icons": "rgb(248, 249, 250)",
      "popup_border": "rgb(129, 161, 193)",
      "sidebar_border": "rgb(94, 129, 172)",
      "sidebar": "rgb(59, 66, 82)",
      "toolbar_field_border": "rgb(76, 86, 106)",
      "toolbar_field_focus": "rgb(59, 66, 82)",
      "toolbar_field_highlight_text": "rgb(248, 249, 250)",
      "toolbar_field_highlight": "rgb(94, 129, 172)",
      "toolbar_field_text_focus": "rgb(248, 249, 250)",
      "tab_loading": "rgb(129, 161, 193)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{634648b6-f6a5-41f7-85c3-4c4630a0df86}"
    }
  }
}