Examine source code of Silver Vampire

{
  "name": "Silver Vampire",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Screenshot 2022-07-01 144455.png"
    },
    "colors": {
      "frame": "rgba(112, 0, 9, 1)",
      "tab_background_text": "rgba(237, 242, 244, 1)",
      "toolbar": "rgba(33, 33, 36, 1)",
      "bookmark_text": "rgba(237, 242, 244, 1)",
      "toolbar_field": "rgba(173, 173, 173, 1)",
      "toolbar_field_text": "rgba(237, 242, 244, 1)",
      "tab_line": "rgba(33, 33, 36, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9f073bea-b92e-4897-a3f6-7434c92c8c6f}"
    }
  }
}