Examine source code of Reddit Pop-up

{
  "manifest_version": 2,
  "name": "Reddit Pop-up",
  "version": "1.0",
  "description": "Allow reddit user to scroll without login/sign-up Pop-up",
  "content_scripts": [
    {
      "matches": [
        "*://*.reddit.com/*"
      ],
      "js": [
        "content.js"
      ],
      "all_frames": true,
      "run_at": "document_end"
    }
  ],
  "browser_action": {
    "default_icon": "icons/reddit_logo.png"
  },
  "permissions": [
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{447f458e-8037-499d-a665-28f2b9eda0c7}"
    }
  }
}