Examine source code of OutOfTheBlue

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "OutOfTheBlue",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-002-609370e89a219e0548ac5ef6b4a7dd2e.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(49, 102, 140)",
      "toolbar_text": "rgba(233, 233, 243, 0.57)",
      "frame": "rgb(16, 50, 76)",
      "tab_background_text": "rgb(210, 209, 232)",
      "toolbar_field": "rgb(44, 145, 212)",
      "toolbar_field_text": "rgb(33, 42, 217)",
      "tab_line": "rgb(1, 224, 248)",
      "popup": "rgb(85, 88, 146)",
      "popup_text": "rgb(74, 167, 242)",
      "icons": "rgb(46, 41, 151)",
      "ntp_background": "rgb(62, 19, 81)",
      "ntp_text": "rgb(41, 90, 151)",
      "tab_loading": "rgb(1, 224, 248)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{5add0747-3f3f-4410-9a93-57c534302869}"
    }
  }
}