chrome-extension-twitter-tweaks/manifest.json

{
  "manifest_version": 2,

  "name": "Twitter Tweaks",
  "version": "0.1.1",
  "description": "Tweaks for the new Twitter UI",

  "content_scripts": [{
    "css": ["styles.css"],
    "matches": ["https://twitter.com/*"]
  }]
}