Clean Gmail

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Clean Gmail",
  "description": "Remove unnecessary elements from Gmail",
  "version": "1.0",
  "content_scripts": [
    {
      "js": [
        "clean.js"
      ],
      "matches": [
        "*://*.google.com/*"
      ]
    }
  ]
}