Examine source code of Larry Filter for Twitter

{
  "manifest_version": 2,
  "name": "Larry Filter",
  "version": "2.5.1",
  "description": "Larry Filter will hide tweets containing a list of words, #hashtags, @usernames or advertising on Twitter.com!",
  "icons": {
    "16": "images/Twitter-16.png",
    "32": "images/Twitter-32.png",
    "48": "images/Twitter-48.png",
    "128": "images/Twitter-128.png"
  },
  "applications": {
    "gecko": {
      "id": "larry@larryfilter.com",
      "strict_min_version": "48.0"
    }
  },
  "content_scripts": [
    {
      "css": [
        "twitter.css"
      ],
      "js": [
        "jquery.js",
        "larryfilter.js"
      ],
      "matches": [
        "http://twitter.com/*",
        "https://twitter.com/*",
        "http://www.twitter.com/*",
        "https://www.twitter.com/*"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_action": {
    "browser_style": false,
    "default_icon": "images/Twitter-32.png",
    "default_popup": "menu.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "tabs",
    "storage",
    "http://twitter.com/*",
    "https://twitter.com/*",
    "http://www.twitter.com/*",
    "https://www.twitter.com/*"
  ],
  "default_locale": "en"
}