Examine source code of Poe Trade Plus

{
  "manifest_version": 3,
  "name": "Poe Trade Plus",
  "description": "Poe Trade Plus enhances the Path of Exile trade site with bookmarks, history and result tools.",
  "version": "1.1.18",
  "icons": {
    "16": "/icon-16.png",
    "32": "/icon-32.png",
    "48": "/icon-48.png",
    "128": "/icon-128.png"
  },
  "permissions": [
    "storage",
    "tabs"
  ],
  "host_permissions": [
    "https://www.pathofexile.com/*",
    "https://br.pathofexile.com/*",
    "https://ru.pathofexile.com/*",
    "https://th.pathofexile.com/*",
    "https://de.pathofexile.com/*",
    "https://fr.pathofexile.com/*",
    "https://es.pathofexile.com/*",
    "https://jp.pathofexile.com/*",
    "https://poe.kakaogames.com/*",
    "https://poe2.kakaogames.com/*",
    "https://poe.ninja/*"
  ],
  "action": {
    "default_title": "Poe Trade Plus",
    "default_icon": {
      "16": "/icon-16.png",
      "32": "/icon-32.png",
      "48": "/icon-48.png",
      "128": "/icon-128.png"
    },
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "poe-trade-plus@kroxilabs.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "background": {
    "type": "module",
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://br.pathofexile.com/trade*",
        "https://de.pathofexile.com/trade*",
        "https://es.pathofexile.com/trade*",
        "https://fr.pathofexile.com/trade*",
        "https://jp.pathofexile.com/trade*",
        "https://pathofexile.com/trade*",
        "https://poe.kakaogames.com/trade*",
        "https://poe2.kakaogames.com/trade*",
        "https://ru.pathofexile.com/trade*",
        "https://th.pathofexile.com/trade*",
        "https://www.pathofexile.com/trade*"
      ],
      "css": [
        "content-scripts/filter-panel.css"
      ],
      "js": [
        "content-scripts/filter-panel.js"
      ],
      "world": "MAIN"
    },
    {
      "matches": [
        "https://br.pathofexile.com/trade*",
        "https://de.pathofexile.com/trade*",
        "https://es.pathofexile.com/trade*",
        "https://fr.pathofexile.com/trade*",
        "https://jp.pathofexile.com/trade*",
        "https://pathofexile.com/trade*",
        "https://poe.kakaogames.com/trade*",
        "https://poe2.kakaogames.com/trade*",
        "https://ru.pathofexile.com/trade*",
        "https://th.pathofexile.com/trade*",
        "https://www.pathofexile.com/trade*"
      ],
      "css": [
        "content-scripts/trade-sidebar.css"
      ],
      "js": [
        "content-scripts/trade-sidebar.js"
      ]
    }
  ]
}