Examine source code of Pink Pixel Hearts

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Pink Pixel Hearts",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center bottom"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(239, 226, 228)",
      "toolbar_text": "rgb(215, 98, 124)",
      "frame": "rgb(251, 218, 221)",
      "tab_background_text": "rgb(238, 166, 172)",
      "toolbar_field": "rgb(255, 251, 252)",
      "toolbar_field_text": "rgb(215, 98, 124)",
      "tab_line": "rgb(238, 166, 172)",
      "popup": "rgb(251, 218, 221)",
      "popup_text": "rgb(215, 98, 124)",
      "tab_loading": "rgb(238, 166, 172)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{47c43652-2821-4895-b9f3-4769f094038a}"
    }
  }
}