Examine source code of Thundercats original

{
  "theme": {
    "images": {
      "theme_frame": "BrowserHeadlinerthundercats.jpg"
    },
    "colors": {
      "frame": "#fafafa",
      "tab_background_text": "#fafafa"
    }
  },
  "version": "2.0",
  "name": "Thundercats original",
  "manifest_version": 2,
  "description": "Thundercats logo with lettering"
}