Examine source code of Rust Never Sleeps Mailbox

{
  "theme": {
    "images": {
      "theme_frame": "RustNeverSleepsMailboyPers_small-1.jpg"
    },
    "colors": {
      "frame": "#99590b",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Rust Never Sleeps Mailbox",
  "manifest_version": 2,
  "description": "Custom made mailbox, with pliers flag. \nIn \"Carried Away-True Stories from Letter Carriers\",  book benefiting Postal Employees Relief Fund (PERF). \n<a href=\"https://outgoing.prod.mozaws.net/v1/694c6d352ac07700f232e37e4d9f7e55cb803b2590b4ac5557eefdf936ccc33e/http%3A//carriedawaytruestories.blogspot.com/\" rel=\"nofollow\">http://carriedawaytruestories.blogspot.com/</a>   Go to site to order book, 100% of proceeds benefit"
}