Examine source code of Reddit Slideshow

{
  "background": {
    "persistent": false,
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Reddit Slideshow"
  },
  "content_scripts": [
    {
      "js": [
        "contentScript.js"
      ],
      "matches": [
        "*://*.reddit.com/*"
      ]
    }
  ],
  "description": "Slide Show for Reddit web just like in the app",
  "icons": {
    "32": "images/icon-32-opaque.png",
    "48": "images/icon-48-opaque.png",
    "128": "images/icon-128-opaque.png"
  },
  "manifest_version": 2,
  "name": "Reddit Slideshow",
  "browser_specific_settings": {
    "gecko": {
      "id": "glacialrevelation@gmail.com",
      "strict_min_version": "74.0"
    }
  },
  "permissions": [
    "activeTab",
    "*://*.reddit.com/*"
  ],
  "version": "1.1.2"
}