Examine source code of Sleek Blue & White

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Sleek Blue & White",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(255, 255, 255)",
      "toolbar_text": "rgb(49, 49, 255)",
      "frame": "rgb(49, 49, 255)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(241, 241, 241)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgb(147, 147, 255)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(0, 0, 0)",
      "tab_loading": "rgb(147, 147, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{cbb33ee7-bf1d-461f-b555-dc557810e1b9}"
    }
  }
}