Examine source code of Reddit Account Switcher

{
  "manifest_version": 3,
  "name": "Reddit Account Switcher",
  "version": "0.1.4",
  "description": "Routes Reddit tabs into the correct Firefox container based on subreddit.",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "permissions": [
    "tabs",
    "storage",
    "contextualIdentities",
    "cookies"
  ],
  "host_permissions": [
    "https://www.reddit.com/*",
    "https://old.reddit.com/*"
  ],
  "background": {
    "scripts": [
      "lib/shared.js",
      "lib/storage.js",
      "background.js"
    ]
  },
  "action": {
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "64": "icons/icon-64.png"
    },
    "default_title": "Reddit Account Switcher",
    "default_popup": "popup.html"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.reddit.com/*",
        "https://old.reddit.com/*"
      ],
      "js": [
        "reddit-observer.js"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "unbound-sigbreak-ras.kylf3@slmail.me",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "strict_min_version": "121.0"
    }
  }
}