Examine source code of Forgotten Times 2

{
  "name": "Forgotten Times 2",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "abstrakt63.png"
    },
    "colors": {
      "frame": "rgba(255, 255, 255, 1)",
      "tab_background_text": "rgba(227, 227, 227, 1)",
      "toolbar": "rgba(68, 105, 79, 0.84)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(66, 68, 117, 0.5)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(255, 255, 255, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4c28f748-7c40-4c58-9fc7-66793ac91634}"
    }
  }
}