Examine source code of Graphite

{
  "manifest_version": 2,
  "name": "Graphite",
  "version": "1.2",
  "description": "A clean graphite Firefox theme with crystal-grey accents.",
  "icons": {
    "48": "icons/48.png",
    "96": "icons/96.png"
  },
  "theme": {
    "colors": {
      "frame": "#0f0f10",
      "tab_background_text": "#c9c9cc",
      "toolbar": "#151517",
      "toolbar_text": "#d2d2d6",
      "toolbar_field": "#1b1b1e",
      "toolbar_field_text": "#e0e0e3",
      "tab_line": "#2a2a2e",
      "tab_selected": "#26262a",
      "tab_text": "#ededf0",
      "popup": "#1a1a1d",
      "popup_text": "#d6d6da",
      "icons": "#b8b8bd",
      "icons_attention": "#d0d0d4"
    },
    "properties": {
      "color_scheme": "dark"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{dfbb7824-24a3-4795-b1a0-eebaaa809e00}"
    }
  }
}