Examine source code of Dark Matcha

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Dark Matcha",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(158, 179, 131)",
      "toolbar_text": "rgb(22, 25, 18)",
      "frame": "rgb(112, 128, 93)",
      "tab_background_text": "rgb(22, 25, 18)",
      "toolbar_field": "rgb(237, 237, 240)",
      "toolbar_field_text": "rgb(22, 25, 18)",
      "tab_line": "rgb(22, 25, 18)",
      "popup": "rgb(158, 179, 131)",
      "popup_text": "rgb(22, 25, 18)",
      "tab_loading": "rgb(22, 25, 18)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8e735721-18a7-45f8-8c10-e3aa2fffc282}"
    }
  }
}