Examine source code of No Politics

{
  "manifest_version": 2,
  "name": "No Politics",
  "version": "1.0.1",
  "description": "Remove political posts from your feed.",
  "icons": {
    "48": "icons/48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.reddit.com/*"
      ],
      "js": [
        "index.js"
      ]
    }
  ],
  "permissions": [
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{f20b7e90-12bf-4e72-9980-d63f6b7ab3d7}"
    }
  }
}