Examine source code of Seven Days

{
  "theme": {
    "images": {
      "theme_frame": "ffhead2copy.jpg"
    },
    "colors": {
      "frame": "#808080",
      "tab_background_text": "#b5b5b5"
    }
  },
  "version": "2.0",
  "name": "Seven Days",
  "manifest_version": 2,
  "description": "You can use the browser backgrounds addon (<a href=\"https://addons.mozilla.org/en-US/firefox/addon/10550\" rel=\"nofollow\">https://addons.mozilla.org/en-US/firefox/addon/10550</a>) with this picture (<a href=\"https://outgoing.prod.mozaws.net/v1/bc397b63cce82ab26132def9fe4a5f683f39a3c00dbea00d45862f09893247b4/http%3A//img94.imageshack.us/my.php%3Fimage=minidesk2.jpg\" rel=\"nofollow\">http://img94.imageshack.us/my.php?image=minidesk2.jpg</a>) along with this persona to create a cool see-through effect in new tabs when you have this picture (<a href=\"https://outgoing.prod.mozaws.net/v1/4dd0615d2f043a366a1608db8e4846d0f8328118c7947907fb32f181ca535b0a/http%3A//img139.imageshack.us/my.php%3Fimage=7dayswws.jpg\" rel=\"nofollow\">http://img139.imageshack.us/my.php?image=7dayswws.jpg</a>) as your desktop background. Designed with Dell Inspiron 15's Desktop resolution in mind (1366x768).\nOriginal Pic: (<a href=\"https://outgoing.prod.mozaws.net/v1/047e5817a6fe502a797a7bc4d1df5b44fc5e4e6a7461eb38d6b472e255ba1dbf/http%3A//dmy-gfx.deviantart.com/art/7-DAYS-91276465\" rel=\"nofollow\">http://dmy-gfx.deviantart.com/art/7-DAYS-91276465</a>)\nUpdated for Firefox 4!"
}