Examine source code of MangaAngel

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#454545"
    }
  },
  "version": "2.0",
  "name": "MangaAngel",
  "manifest_version": 2,
  "description": "My first theme. It is one of my favorite anime wallpapers off the web (in colour), so I have edited it to look manga-style. I do not own this wallpaper entirely. Credits to the artist who made this.\n\n\n\n\nNOTE: This is a full Height theme! (at 200px Height) You will not see the whole theme by default(to most users).\nTo \"fix\", click on the link below on someone's demo on how to make the header visible to see the whole theme:\n<a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/ce92ab5e3b1903e8026d1f8c37c8cb156e68d40ddeb97d3becef60d4f0e2825e/https%3A//www.youtube.com/watch%3Fv=b7CwnD3IjtY\">https://www.youtube.com/watch?v=b7CwnD3IjtY</a>"
}