Examine source code of dark gato

{
  "manifest_version": 2,
  "name": "dark gato",
  "version": "0.2",
  "theme": {
    "images": {
      "theme_frame": "temp.gif"
    },
    "colors": {
      "frame": "#262727",
      "tab_line": "rgba(255, 255, 255, 0)",
      "tab_selected": "#f0d3c9",
      "tab_text": "#262727",
      "icons_attention": "#f0d3c9",
      "tab_background_text": "#fff",
      "toolbar": "#343231",
      "toolbar_field": "#fff",
      "button_background_hover": "#f0d3c9"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{56e90ab7-bcab-4f48-a772-872a747a0107}"
    }
  }
}