Examine source code of Elegant Matte

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "@_rogercas",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(45, 45, 45)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgba(15, 15, 15, 0.81)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(90, 90, 90)",
      "popup": "rgba(45, 45, 45, 0.79)",
      "popup_text": "rgb(255, 255, 255)",
      "ntp_background": "rgb(45, 45, 45)",
      "ntp_text": "rgb(255, 255, 255)",
      "tab_selected": "rgb(45, 45, 45)",
      "tab_text": "rgb(255, 255, 255)",
      "tab_loading": "rgb(90, 90, 90)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c92ee92c-9bf4-44e2-bb6a-23e2463e0e73}"
    }
  }
}