Examine source code of Metal Pro

{
  "name": " Metal Pro",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Screenshot 2022-05-21 155500.png"
    },
    "colors": {
      "frame": "rgba(47, 47, 61, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(70, 36, 224, 1)",
      "bookmark_text": "rgba(77, 69, 69, 1)",
      "toolbar_field": "rgba(86, 87, 97, 1)",
      "toolbar_field_text": "rgba(37, 35, 48, 1)",
      "tab_line": "rgba(59, 72, 156, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6d0b1047-2aac-414c-9ae6-14d642a90ce8}"
    }
  }
}