Examine source code of Graphite Grace

{
  "manifest_version": 2,
  "version": "1.1",
  "name": "Graphite Grace",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(52, 60, 67)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(52, 60, 67)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgba(27, 39, 47, 0.97)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgba(255, 255, 255, 0.21)",
      "popup": "rgba(27, 39, 47, 0.97)",
      "popup_text": "rgb(255, 255, 255)",
      "tab_selected": "rgb(71, 88, 101)",
      "tab_loading": "rgba(255, 255, 255, 0.21)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1eab5e57-8528-48d5-bec1-326bf1d52e15}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "strict_min_version": "142.0"
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  }
}