Examine source code of Hearts influx

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Hearts influx ",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(255, 255, 255, 0.5)",
      "toolbar_text": "rgb(0, 0, 0)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(66, 0, 118)",
      "toolbar_field": "rgb(255, 241, 239)",
      "toolbar_field_text": "rgb(255, 0, 158)",
      "tab_line": "rgb(255, 234, 0)",
      "popup": "rgb(227, 255, 214)",
      "popup_text": "rgb(0, 103, 255)",
      "tab_loading": "rgb(255, 234, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{22bfb6a9-873e-4f8f-9083-113c9b11679a}"
    }
  }
}