Examine source code of silent blue

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "silent blue",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-002-609370e89a219e0548ac5ef6b4a7dd2e.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(203, 218, 219)",
      "toolbar_text": "rgb(3, 3, 3)",
      "frame": "rgb(117, 173, 185)",
      "tab_background_text": "rgb(4, 4, 4)",
      "toolbar_field": "rgba(253, 253, 253, 0.7)",
      "toolbar_field_text": "rgb(17, 17, 16)",
      "tab_line": "rgb(37, 32, 31)",
      "popup": "rgb(233, 243, 244)",
      "popup_text": "rgb(15, 15, 15)",
      "icons": "rgb(15, 15, 15)",
      "tab_loading": "rgb(37, 32, 31)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9e4f5a6a-9c73-4cdb-83e0-ee5c328360d1}"
    }
  }
}