Examine source code of Dreamstime light theme

{
  "theme": {
    "images": {
      "theme_frame": "Dreamstime_skin2.jpg"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#000"
    }
  },
  "version": "2.0",
  "name": "Dreamstime light theme",
  "manifest_version": 2,
  "description": "Part of a Persona competition on <a href=\"https://outgoing.prod.mozaws.net/v1/dd455a6bf5c3e98b6814eb502700880014fcece4ce04e58e230096a5473d94b3/http%3A//Dreamstime.com\" rel=\"nofollow\">Dreamstime.com</a>"
}