Examine source code of Tap Counter New Tab

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Hexagon Textured Artwork Pattern",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(20, 137, 38)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(8, 74, 144)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgba(38, 45, 26, 0.75)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(182, 23, 82)",
      "popup": "rgb(10, 87, 21)",
      "popup_text": "rgb(255, 255, 255)",
      "tab_loading": "rgb(182, 23, 82)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1e1aead3-59b8-4405-8c5e-b764f30bb7d6}"
    }
  }
}