Examine source code of Remove Recents Reddit

{
  "manifest_version": 2,
  "name": "Remove Recents",
  "version": "1.1",
  "description": "Remove the recents from Reddit",
  "icons": {
    "48": "icons/icon-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.reddit.com/*"
      ],
      "js": [
        "removerecents.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "removerecents@kairosthegoat.com"
    }
  }
}