Examine source code of Pretty Pastel Rainbow

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Purple Rainbow",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(226, 187, 245)",
      "toolbar_text": "rgb(185, 61, 183)",
      "frame": "rgb(241, 172, 214)",
      "tab_background_text": "rgb(182, 51, 173)",
      "toolbar_field": "rgb(247, 201, 237)",
      "toolbar_field_text": "rgb(232, 63, 170)",
      "tab_line": "rgb(247, 165, 216)",
      "popup": "rgb(249, 192, 229)",
      "popup_text": "rgb(166, 53, 146)",
      "button_background_hover": "rgb(187, 229, 250)",
      "tab_loading": "rgb(247, 165, 216)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{57e11897-901e-4b28-977c-f5b633bad9fd}"
    }
  }
}