Examine source code of Monochrome Memory

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Monochrome Memory",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg",
        "images/1.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center top",
        "left center"
      ],
      "additional_backgrounds_tiling": [
        "repeat",
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(0, 0, 0, 0.87)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(82, 0, 5)",
      "tab_background_text": "rgb(0, 0, 0)",
      "toolbar_field": "rgba(108, 108, 108, 0.63)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(255, 255, 255)",
      "popup": "rgb(61, 61, 61)",
      "popup_text": "rgb(201, 201, 201)",
      "tab_loading": "rgb(255, 255, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{406f0124-f237-4113-865d-73929b6f28a5}"
    }
  }
}