Examine source code of Forgotten Times

{
  "name": "Forgotten Times",
  "manifest_version": 2,
  "version": "5.0",
  "theme": {
    "images": {
      "theme_frame": "old-pattern.png"
    },
    "colors": {
      "frame": "rgba(176, 169, 41, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(31, 31, 31, 0.68)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(138, 8, 136, 0.26)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(150, 150, 150, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{876da5ce-7abf-4a25-970a-c35f5fb88f49}"
    }
  }
}