Examine source code of Reddit Custom Feeds

{
  "manifest_version": 2,
  "name": "Reddit Custom Feeds",
  "version": "1.1resigned1",
  "description": "Categorize your subscirbed subreddits into personalized feeds. Want only sports news? Add all the sports-related subreddits into your 'sports' custom feed and watch it appear under the Reddit feeds column.",
  "permissions": [
    "activeTab",
    "storage"
  ],
  "icons": {
    "48": "reddit_48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.reddit.com/*"
      ],
      "css": [
        "content.css"
      ],
      "js": [
        "jquery-3.3.1.min.js",
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{d319ccad-e350-4efe-bd85-8baed45912b3}"
    }
  }
}