Grayscale Favicons

{
    "update_url": "https:\/\/clients2.google.com\/service\/update2\/crx",
    "manifest_version": 3,
    "name": "Grayscale Favicons",
    "description": "Desaturates the icons in your tabs.",
    "version": "0.5",
    "permissions": [
        "favicon"
    ],
    "content_scripts": [
        {
            "matches": [
                "<all_urls>"
            ],
            "js": [
                "js\/content.js"
            ]
        }
    ],
    "web_accessible_resources": [
        {
            "resources": [
                "_favicon\/*"
            ],
            "matches": [
                "<all_urls>"
            ],
            "extension_ids": [
                "*"
            ]
        }
    ],
    "icons": {
        "16": "icons\/icon16.png",
        "48": "icons\/icon48.png",
        "128": "icons\/icon128.png"
    }
}