Examine source code of no_tftcards_message

{
  "manifest_version": 2,
  "name": "Twitch Chat Filter",
  "version": "1.0",
  "description": "Masque les messages spécifiques dans le chat Twitch.",
  "browser_specific_settings": {
    "gecko": {
      "id": "twitch-chat-filter@exemple.com"
    }
  },
  "permissions": [
    "activeTab",
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://www.twitch.tv/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ]
}