Examine source code of Get APK Mod

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Get APK Mod",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(31, 110, 170)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(18, 122, 221)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(121, 79, 209)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(85, 227, 101)",
      "popup": "rgb(12, 115, 193)",
      "popup_text": "rgb(255, 255, 255)",
      "tab_loading": "rgb(85, 227, 101)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a1e511f4-2a43-4e60-9a68-7b3730225744}"
    }
  }
}