Examine source code of shikisama

{
  "name": "shikisama",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "f95918fdcccaec7a95d5bcda7ddd67335bc492e8[1].png"
    },
    "colors": {
      "frame": "rgba(0, 77, 30, 0.29)",
      "tab_background_text": "rgba(18, 112, 92, 1)",
      "toolbar": "rgba(58, 153, 65, 0)",
      "bookmark_text": "rgba(24, 173, 141, 1)",
      "toolbar_field": "rgba(97, 217, 46, 0.31)",
      "toolbar_field_text": "rgba(53, 44, 133, 1)",
      "tab_line": "rgba(43, 255, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{89248324-35a4-43a3-bdf0-311d358dbd8a}"
    }
  }
}