Examine source code of Expando

{
  "manifest_version": 2,
  "name": "Expando",
  "version": "1.1resigned1",
  "description": "Expands image and video previews from subreddits, and deletes everything else.",
  "content_scripts": [
    {
      "matches": [
        "*://*.reddit.com/*"
      ],
      "js": [
        "notext.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{7e6ff170-4eaf-4817-9564-1353e8d178ea}"
    }
  }
}