Examine source code of Blood Cell Game

{
  "manifest_version": 2,
  "name": "Blood Cell Game",
  "version": "1.0",
  "description": "A browser game in which you are a white blood cell hunting for the one infected red blood cell. The infected cell uses an evolutionary algorithm to gradually adopt strategies that work best against you, so the game gets harder as you get better.",
  "icons": {
    "48": "icons/BloodCellLogo-48.png"
  },
  "browser_action": {
    "default_area": "tabstrip",
    "default_icon": "icons/BloodCellLogo-32.png",
    "default_title": "Blood Cell"
  },
  "background": {
    "scripts": [
      "launch_blood_cell.js"
    ]
  },
  "permissions": [
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{9eb27d86-9ff7-4c1e-8f07-c1512edb355f}"
    }
  }
}