Examine source code of Darkain

{
  "manifest_version": 2,
  "version": "1.0.1",
  "name": "Darkain",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(255, 255, 255)",
      "toolbar_text": "rgb(48, 48, 48)",
      "toolbar_field": "rgb(240, 240, 240)",
      "toolbar_field_focus": "rgb(230, 230, 230)",
      "toolbar_field_text": "rgb(48, 48, 48)",
      "toolbar_field_highlight": "rgb(200, 200, 200)",
      "toolbar_field_highlight_text": "rgb(48, 48, 48)",
      "toolbar_bottom_separator": "rgb(45, 45, 45)",
      "toolbar_field_border_focus": "rgb(68, 68, 68)",
      "frame": "rgb(48, 48, 48)",
      "tab_background_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(255, 255, 255)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(48, 48, 48)",
      "popup_highlight_text": "rgb(48, 48, 48)",
      "popup_highlight": "rgb(200, 200, 200)",
      "tab_loading": "rgb(48, 48, 48)",
      "ntp_background": "rgb(48, 48, 48)",
      "ntp_text": "rgb(180, 180, 180)",
      "sidebar": "rgb(255, 255, 255)",
      "sidebar_highlight": "rgb(200, 200, 200)",
      "sidebar_highlight_text": "rgb(48, 48, 48)",
      "sidebar_text": "rbg(48, 48, 48)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{81ddced3-9ea9-493b-9e00-7d9ed5b6a788}"
    }
  }
}