Examine source code of Black Dots Illusion

{
  "theme": {
    "images": {
      "theme_frame": "FirefoxPersona-BLZ-Grid-Dots-Illusion-header.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#b6ff9f"
    }
  },
  "version": "2.0",
  "name": "Black Dots Illusion",
  "manifest_version": 2,
  "description": "As you look around the header, do you see black dots blinking on over the white dots?  There are only white dots over the gray grid.\nTo rate or comment, login here:\n<a href=\"https://addons.mozilla.org/en-US/firefox/addon/black-dots-illusion/#id=372510\" rel=\"nofollow\">https://addons.mozilla.org/en-US/firefox/addon/black-dots-illusion/#id=372510</a> \nSee all my personas here:\n<a href=\"https://addons.mozilla.org/en-US/firefox/collections/BrianZ/personas/\" rel=\"nofollow\">https://addons.mozilla.org/en-US/firefox/collections/BrianZ/personas/</a> \n(optical illusion, black, white, dots, gray, grid)\n(c) 2012 BrianZ  All Rights Reserved"
}