Examine source code of Heart rain

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Heart storm",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(250, 225, 255, 0.5)",
      "toolbar_text": "rgb(127, 0, 206)",
      "frame": "rgb(255, 253, 226)",
      "tab_background_text": "rgb(151, 0, 79)",
      "toolbar_field": "rgb(255, 253, 226)",
      "toolbar_field_text": "rgb(0, 133, 78)",
      "tab_line": "rgb(255, 0, 195)",
      "popup": "rgb(255, 226, 248)",
      "popup_text": "rgb(0, 133, 255)",
      "tab_loading": "rgb(255, 0, 195)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{95f1015f-f58e-4bb0-a88d-993aab4d3884}"
    }
  }
}