Examine source code of blue aesthetic

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "blue aesthetic",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(188, 228, 232)",
      "toolbar_text": "rgb(33, 33, 29)",
      "frame": "rgb(63, 148, 191)",
      "tab_background_text": "rgb(0, 0, 0)",
      "toolbar_field": "rgba(116, 207, 248, 0.57)",
      "toolbar_field_text": "rgb(15, 15, 13)",
      "tab_line": "rgb(0, 0, 0)",
      "popup": "rgb(188, 209, 232)",
      "popup_text": "rgb(0, 0, 0)",
      "tab_loading": "rgb(0, 0, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{02e23ed0-d2f3-4390-81ce-5fc619ca8704}"
    }
  }
}