Examine source code of sandpaper

{
  "name": "Sandy",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "sand.png"
    },
    "colors": {
      "frame": "rgba(247, 222, 188, 1)",
      "tab_background_text": "rgba(18, 11, 0, 0.74)",
      "toolbar": "rgba(255, 251, 224, 0.49)",
      "toolbar_field": "rgba(255, 251, 240, 1)",
      "toolbar_field_text": "rgba(71, 41, 11, 1)",
      "tab_line": "rgba(240, 237, 221, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{26ba1727-4531-4b40-a91f-925cd39ffb3d}"
    }
  }
}