Examine source code of StopTwitterSpam

{
  "name": "StopTwitterSpam",
  "version": "0.2resigned1",
  "description": "Anything beyond two hashtags is excessive. This extension hides tweets with more than three hashtags.",
  "content_scripts": [
    {
      "js": [
        "js/jquery.js",
        "js/purge.js"
      ],
      "matches": [
        "https://twitter.com/*"
      ]
    }
  ],
  "icons": {
    "36": "img/ldpi.png",
    "48": "img/mdpi.png",
    "72": "img/hdpi.png",
    "96": "img/xhdpi.png",
    "128": "img/target.png",
    "144": "img/xxhdpi.png",
    "192": "img/xxxhdpi.png"
  },
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{5411ca43-b668-4c10-a5bd-5fb3198b2c0f}"
    }
  }
}