Examine source code of Math_Top

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Maths_Top",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(76, 79, 76)",
      "toolbar_text": "rgb(228, 232, 220)",
      "frame": "rgb(201, 197, 197)",
      "tab_background_text": "rgb(228, 232, 220)",
      "toolbar_field": "rgba(202, 202, 202, 0.7)",
      "toolbar_field_text": "rgb(230, 76, 28)",
      "tab_line": "rgb(231, 47, 12)",
      "popup": "rgb(202, 202, 202)",
      "popup_text": "rgb(230, 76, 28)",
      "tab_loading": "rgb(231, 47, 12)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a52be924-f66b-4d81-a8d2-7c48f3faae93}"
    }
  }
}