Examine source code of Hide Twitter Ads

{
  "manifest_version": 2,
  "name": "Hide Twitter Ads - Block Promoted Tweets",
  "short_name": "Hide Twitter Ads",
  "description": "Free tool that hides Promoted Tweets while you browse Twitter.",
  "browser_action": {
    "default_icon": "icons/hide-twitter-ads-128.png"
  },
  "version": "1.1.3",
  "icons": {
    "16": "icons/hide-twitter-ads-16.png",
    "48": "icons/hide-twitter-ads-48.png",
    "128": "icons/hide-twitter-ads-128.png"
  },
  "permissions": [],
  "background": {
    "scripts": [
      "icon.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "http://*.twitter.com/*",
        "https://*.twitter.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{c4405324-da84-41d3-9064-da65eaf1660b}"
    }
  }
}