Examine source code of Frankenstein 1931

{
  "theme": {
    "images": {
      "theme_frame": "1932Frank.jpg"
    },
    "colors": {
      "frame": "#e7f5e7",
      "tab_background_text": "#e7f5e7"
    }
  },
  "version": "2.0",
  "name": "Frankenstein 1931",
  "manifest_version": 2,
  "description": "The original monster. Karloff lives on Firefox!"
}