Examine source code of Reddit filter

{
  "manifest_version": 3,
  "name": "Reddit filter",
  "version": "0.2",
  "description": "Filter useless shit out of reddit feed.",
  "permissions": [
    "activeTab",
    "storage",
    "scripting"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{e5f44cc9-43bf-4c28-a9d5-a8ab20825527}"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.reddit.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/no_reddit_16.png",
      "48": "icons/no_reddit_48.png",
      "128": "icons/no_reddit_128.png"
    }
  }
}