Examine source code of maxresdefault

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#30275a",
      "tab_background_text": "#88d7ee"
    }
  },
  "version": "2.0",
  "name": "maxresdefault",
  "manifest_version": 2,
  "description": "Saw that this was a request in the forums so decided ok I'll do it :) <a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/591cd9ee963b655fc1ac0fbf7026d7ece499436550e4af3f51640555e942338a/https%3A//forums.mozilla.org/addons/viewtopic.php%3Ff=33&amp;t=16889\">https://forums.mozilla.org/addons/viewtopic.php?f=33&amp;t=16889</a>\n\nWhat is totally mine: the shiny squares please don't take them with out credit, the rest is just a simple edit.\n\nGlad you like it, nathan_young :)"
}