Examine source code of multi-blue

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Soft blue",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(189, 217, 229)",
      "toolbar_text": "rgb(0, 0, 0)",
      "frame": "rgb(200, 219, 245)",
      "tab_background_text": "rgb(252, 252, 252)",
      "toolbar_field": "rgba(10, 102, 211, 0.22)",
      "toolbar_field_text": "rgb(251, 245, 245)",
      "tab_line": "rgb(100, 100, 158)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(98, 102, 183)",
      "tab_loading": "rgb(100, 100, 158)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{aeae4ac2-0e06-4f2a-83d3-d44152c744ff}"
    }
  }
}