Slither.io Ninja (WASD and more)

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Slither.io Ninja (WASD and more)",
  "description": "WASD to move and (much) more!",
  "version": "1.0.1",
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "icons": {
    "16": "logo/16.png",
    "32": "logo/32.png",
    "48": "logo/48.png",
    "64": "logo/64.png",
    "72": "logo/72.png",
    "96": "logo/96.png",
    "128": "logo/128.png",
    "144": "logo/144.png",
    "192": "logo/192.png",
    "512": "logo/512.png"
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "css": [
        "style.css"
      ],
      "js": [
        "script.js"
      ]
    }
  ],
  "permissions": [
    "storage"
  ]
}