Examine source code of old school vidyagames

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "old school vidyagames",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-005-f5f3cf677b1f132c75ddc7bd319dd1fc.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(18, 18, 18)",
      "toolbar_text": "rgb(19, 185, 15)",
      "frame": "rgb(31, 31, 31)",
      "tab_background_text": "rgb(153, 153, 153)",
      "toolbar_field": "rgb(54, 54, 54)",
      "toolbar_field_text": "rgb(22, 194, 36)",
      "tab_line": "rgb(13, 194, 17)",
      "popup": "rgb(31, 31, 31)",
      "popup_text": "rgb(23, 195, 37)",
      "tab_loading": "rgb(13, 194, 17)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{777e64f0-4775-4299-b62a-ee9e83bc28a2}"
    }
  }
}