Math Marathon Word Problems

Math Marathons is a Marathons of Math Word Problems, Here the kids from 1st to 5th grade can run the different Marathons.
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manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Math Marathon Word Problems",
  "description": "Math Marathons is a Marathons of Math Word Problems, Here the kids from 1st to 5th grade can run the different Marathons.",
  "version": "0.0.0.1",
  "manifest_version": 2,
  "icons": {
    "128": "icon_128.png"
  },
  "app": {
    "urls": [
      "http://www.mathmarathons.com/",
      "http://www.mathmarathons.com/choose_word_problem.html/"
    ],
    "launch": {
      "web_url": "http://www.mathmarathons.com/"
    }
  }
}