Lichess.org chat/whisper with move numbers

{
    "update_url": "https:\/\/clients2.google.com\/service\/update2\/crx",
    "manifest_version": 2,
    "name": "Lichess.org chat\/whisper with move numbers",
    "version": "2021.03.14",
    "description": "Send chat messages or whisper to spectators room with move numbers",
    "content_scripts": [
        {
            "css": [
                "styles.css"
            ],
            "js": [
                "content.js"
            ],
            "matches": [
                "https:\/\/lichess.org\/*"
            ]
        }
    ],
    "permissions": [
        "storage"
    ],
    "options_ui": {
        "page": "options.html",
        "open_in_tab": false
    },
    "icons": {
        "128": "icon128.png"
    },
    "applications": {
        "gecko": {
            "id": "Lichess_Chat_Whisper_Move_Numbers"
        }
    }
}