Examine source code of Colourful gleam

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Colourful gleam",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(255, 106, 164)",
      "toolbar_text": "rgb(255, 212, 14)",
      "frame": "rgb(21, 0, 53)",
      "tab_background_text": "rgb(121, 202, 255)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(0, 132, 102)",
      "tab_line": "rgb(255, 172, 130)",
      "popup": "rgb(199, 219, 255)",
      "popup_text": "rgb(14, 0, 132)",
      "tab_loading": "rgb(255, 172, 130)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d19d7674-22c3-475f-b86b-a017a9ded5f3}"
    }
  }
}