Examine source code of For School

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "For School",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-043-dfcec5f93f7a29f97b030eda45530203.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(53, 35, 255, 0.86)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(255, 255, 255)",
      "tab_background_text": "rgb(0, 0, 0)",
      "toolbar_field": "rgba(255, 255, 255, 0.21)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(255, 255, 255)",
      "popup": "rgb(234, 235, 246)",
      "popup_text": "rgb(7, 0, 255)",
      "tab_loading": "rgb(255, 255, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{fbe6a2a3-59b5-4b3d-9702-a7230dafe74a}"
    }
  }
}