Examine source code of salmon_gradient

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "salmon_gradient",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left bottom"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(180, 121, 113, 0.84)",
      "toolbar_text": "rgba(242, 242, 240, 0.8)",
      "frame": "rgb(180, 121, 113)",
      "tab_background_text": "rgb(255, 254, 252)",
      "toolbar_field": "rgba(127, 80, 77, 0.57)",
      "toolbar_field_text": "rgba(255, 255, 255, 0.8)",
      "tab_line": "rgba(255, 234, 1, 0.99)",
      "popup": "rgba(180, 121, 113, 0.85)",
      "popup_text": "rgba(255, 255, 255, 0.8)",
      "icons": "rgb(232, 199, 203)",
      "ntp_background": "rgb(184, 127, 115)",
      "ntp_text": "rgb(248, 240, 241)",
      "tab_loading": "rgba(255, 234, 1, 0.99)"
    }
  }
}