Examine source code of Happy Groundhogs Day

{
  "theme": {
    "images": {
      "theme_frame": "FirefoxPersona-BLZ-Groundhog-header3.jpg"
    },
    "colors": {
      "frame": "#5c3b1f",
      "tab_background_text": "#fcffa0"
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  },
  "version": "2.0",
  "name": "Happy Groundhogs Day",
  "manifest_version": 2,
  "description": "Feb 2nd is Groundhog's Day, when the groundhog comes out of his winter hibernation to make his weather forecast.  If he sees his shadow, he retreats back into his den, as there will be six more weeks of winter, otherwise there will be an early spring.  That's what my grandfather told me anyway.  I captured this groundhog taking an autumn stroll in the park next to the New River in Radford, Virginia, USA.  \nHappy Groundhogs Day!\n\nTo rate or comment, login here:\n<a href=\"https://addons.mozilla.org/en-US/firefox/addon/happy-groundhogs-day/#id=361414\" rel=\"nofollow\">https://addons.mozilla.org/en-US/firefox/addon/happy-groundhogs-day/#id=361414</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\n(c) 2008 BrianZ"
}