Examine source code of Electric Blue Squared

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Electric Blue Squared",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-021-775b159da029a74f5c76e835cd65e9dc.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(16, 95, 217)",
      "toolbar_text": "rgb(195, 204, 217)",
      "frame": "rgb(11, 68, 153)",
      "tab_background_text": "rgb(195, 204, 217)",
      "toolbar_field": "rgb(11, 68, 153)",
      "toolbar_field_text": "rgb(195, 204, 217)",
      "tab_line": "rgb(6, 41, 102)",
      "popup": "rgb(11, 68, 153)",
      "popup_text": "rgb(195, 204, 217)",
      "tab_loading": "rgb(6, 41, 102)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{bfb30a34-9a40-4de2-94de-734b681e658a}"
    }
  }
}