Examine source code of digital horses1

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "digital horses1",
  "manifest_version": 2,
  "description": "<a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/0f6c8b2ab40b24aae91d164c3c3951bfbf507142018d4fcaf4f6c202b5339318/https%3A//www.youtube.com/watch%3Fv=61cceAXnC6w\">https://www.youtube.com/watch?v=61cceAXnC6w</a>\n<a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/6d440545e8ea6c9654191f722668897f18be93796b01ebc75086a623d632aced/https%3A//www.youtube.com/watch%3Fv=brEYXm9yw88\">https://www.youtube.com/watch?v=brEYXm9yw88</a>\n\n<a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/db2c8503e071f887788a66c814525f8b16859208945bc2b0b6568be9fa841f31/https%3A//www.youtube.com/watch%3Fv=PMR7oHJoXTA\">https://www.youtube.com/watch?v=PMR7oHJoXTA</a>\n<a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/e6515f97babb78d33c0b9515de4de354c11acfe1944867a82c9e06b94d7f33d5/https%3A//www.youtube.com/watch%3Fv=dvs9hwxE7YA&amp;list=PL0A1F5EC43873B612\">https://www.youtube.com/watch?v=dvs9hwxE7YA&amp;list=PL0A1F5EC43873B612</a>"
}