2048

Use the arrow keys to move the tiles. When two tiles with the same number touch, they merge into one and the value will double.

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manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "2048",
  "version": "1.2",
  "description": "Use the arrow keys to move the tiles. When two tiles with the same number touch, they merge into one and the value will double.",
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "browser_action": {
    "default_icon": "icon16.png",
    "default_popup": "popup.html"
  }
}