Examine source code of Tibia Prices

{
  "manifest_version": 2,
  "name": "Tibia Prices",
  "description": "Tibia TC to PLN price converter for the character trade market",
  "version": "1.2.0",
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "96": "icon/96.png",
    "128": "icon/128.png"
  },
  "permissions": [
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      },
      "id": "{7f8268ca-c911-4459-b3a1-a7c918533920}"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Tibia TC → PLN",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.tibia.com/charactertrade/*",
        "*://www.tibia.com/community*"
      ],
      "all_frames": true,
      "js": [
        "content-scripts/character-links.js"
      ]
    },
    {
      "matches": [
        "*://www.tibia.com/charactertrade/*"
      ],
      "js": [
        "content-scripts/content.js",
        "content-scripts/outfit-filter.js"
      ]
    }
  ]
}