Examine source code of Parasite Eve Header.

{
  "name": "Parasite Eve Theme.",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Web capture_11-9-2022_1723_.jpeg"
    },
    "colors": {
      "frame": "rgba(38, 38, 38, 1)",
      "tab_background_text": "rgba(0, 0, 0, 0.83)",
      "toolbar": "rgba(112, 2, 2, 0.62)",
      "bookmark_text": "rgba(0, 0, 0, 1)",
      "toolbar_field": "rgba(196, 196, 196, 0.8)",
      "toolbar_field_text": "rgba(41, 41, 41, 1)",
      "tab_line": "rgba(212, 212, 212, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{51b0668b-270c-4667-8f77-405340f5f706}"
    }
  }
}