Examine source code of Stalker Cat 1

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#00001A",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Stalker Cat 1",
  "manifest_version": 2,
  "description": "Original Art by <a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/b74d4dba08a0f0dbac8e78e3509956386690dd464a18df1576a4f0ef41eaec06/http%3A//trenchmaker.deviantart.com/\">http://trenchmaker.deviantart.com/</a>"
}