Examine source code of Matrix Puzzle Game

{
  "manifest_version": 2,
  "name": "Matrix Puzzle Game",
  "version": "1.0",
  "description": "Solve number or geometric matrix puzzles.",
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_popup": "index.html",
    "default_icon": "icon.png"
  },
  "permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "{1e96c94e-5318-4c76-bbf2-94c8a2c945c2}"
    }
  }
}