Examine source code of Reddit Quick Block

{
  "manifest_version": 2,
  "name": "Reddit Quick Block",
  "version": "1.0.0",
  "description": "Quickly block Reddit users with one click. Adds a Block button next to every author name and inside the '...' overflow menu on posts and comments.",
  "author": "chozabu@gmail.com",
  "icons": {
    "48": "icon48.png",
    "96": "icon96.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "chozabu@gmail.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "permissions": [
    "https://www.reddit.com/*",
    "https://old.reddit.com/*",
    "https://sh.reddit.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.reddit.com/*",
        "https://old.reddit.com/*",
        "https://sh.reddit.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ]
}