Examine source code of Reddit Helper

{
  "manifest_version": 2,
  "name": "Reddit Helper",
  "version": "1.1resigned1",
  "description": "Removes erroneous \"welcome\" message that pops up on reddit.",
  "icons": {
    "48": "rh-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.reddit.com/*"
      ],
      "js": [
        "rh.js"
      ]
    }
  ],
  "applications": {
    "gecko": {
      "id": "rh@reddit.com"
    }
  }
}