Examine source code of Overclock.net Theme

{
  "theme": {
    "images": {
      "theme_frame": "OCNheaderr2.jpg"
    },
    "colors": {
      "frame": "#d4d4d4",
      "tab_background_text": "#d9caca"
    }
  },
  "version": "2.0",
  "name": "Overclock.net Theme",
  "manifest_version": 2,
  "description": "Theme I made for <a href=\"https://outgoing.prod.mozaws.net/v1/0e487e176d66ad9656d1902deaa1186e307ac021b65875c0b52b2cacc0ab4748/http%3A//Overclock.net\" rel=\"nofollow\">Overclock.net</a> for smaller header area in Firefox."
}