Examine source code of stucky shield catch

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "stucky",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png",
        "images/1.png",
        "images/2.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left top",
        "right top",
        "center top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat",
        "no-repeat",
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(17, 115, 231)",
      "toolbar_text": "rgb(188, 190, 143)",
      "frame": "rgb(17, 115, 231)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(158, 30, 15)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(158, 30, 15)",
      "popup": "rgb(17, 115, 231)",
      "popup_text": "rgb(188, 190, 143)",
      "tab_loading": "rgb(158, 30, 15)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{34c99d72-f5de-4238-8a71-dcd87bbb0d5d}"
    }
  }
}