Examine source code of Reddit Feed Blocker

{
  "manifest_version": 2,
  "name": "Reddit Feed Blocker",
  "version": "1.0.1",
  "description": "Blocks unwanted subreddits in /r/popular and /r/all",
  "permissions": [
    "storage"
  ],
  "icons": {
    "48": "icons/icon-48.svg",
    "96": "icons/icon-96.svg"
  },
  "browser_action": {
    "default_icon": "icons/icon-48.svg",
    "default_popup": "popup/popup.html",
    "default_title": "Reddit Feed Blocker"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.reddit.com/r/popular*",
        "*://*.reddit.com/r/all*",
        "*://*.reddit.com/r/Popular*",
        "*://*.reddit.com/r/All*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "reddit-feed-blocker@extension",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}