Examine source code of Minesweeper Classic

{
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "32.png"
  },
  "description": "Minesweeper Classic game for firefox",
  "icons": {
    "16": "32.png",
    "48": "64.png",
    "128": "128.png"
  },
  "web_accessible_resources": [
    "minesweeper.css",
    "minesweeper.js",
    "main.js",
    "bored.gif",
    "erasing.gif",
    "happy.gif"
  ],
  "manifest_version": 2,
  "name": "Minesweeper Classic",
  "options_ui": {
    "page": "option.html"
  },
  "version": "0.1"
}