Examine source code of Subreddit Sidebar Remover

{
  "manifest_version": 2,
  "name": "An Extension",
  "version": "1.0.6",
  "description": "My first extension",
  "icons": {
    "48": "icons/border-48.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icons/border-48.png",
    "default_title": "Bypass Subreddit"
  },
  "content_scripts": [
    {
      "js": [
        "testScript.js"
      ],
      "matches": [
        "https://www.reddit.com/*"
      ],
      "run_at": "document_end"
    }
  ]
}