Examine source code of cream

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "cream",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(240, 235, 215)",
      "toolbar_text": "rgb(12, 12, 12)",
      "frame": "rgb(240, 235, 215)",
      "tab_background_text": "rgb(2, 35, 36)",
      "toolbar_field": "rgb(240, 235, 215)",
      "toolbar_field_text": "rgb(7, 9, 3)",
      "tab_line": "rgb(100, 205, 249)",
      "popup": "rgb(240, 235, 215)",
      "popup_text": "rgb(10, 16, 0)",
      "button_background_active": "rgb(60, 246, 118)",
      "button_background_hover": "rgb(16, 224, 205)",
      "icons_attention": "rgb(84, 89, 89)",
      "ntp_background": "rgb(212, 210, 202)",
      "ntp_text": "rgb(208, 206, 217)",
      "tab_loading": "rgb(100, 205, 249)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ded99482-58f5-4967-9405-ec0e216a7081}"
    }
  }
}