Monochrome Mode: Grayscale browsing

{
    "update_url": "https:\/\/clients2.google.com\/service\/update2\/crx",
    "manifest_version": 3,
    "name": "Monochrome Mode: Grayscale browsing",
    "short_name": "Monochrome Mode",
    "description": "Monochrome Mode: Grayscale browsing for focus and readability.",
    "version": "1.1.1",
    "author": "Pedro Souto",
    "background": {
        "service_worker": "js\/background.js"
    },
    "content_scripts": [
        {
            "matches": [
                "*:\/\/*\/*"
            ],
            "js": [
                "js\/content.js"
            ],
            "run_at": "document_start"
        }
    ],
    "icons": {
        "16": "img\/16-icon-monochrome-on.png",
        "32": "img\/32-icon-monochrome-on.png",
        "48": "img\/48-icon-monochrome-on.png",
        "128": "img\/128-icon-monochrome-on.png"
    },
    "permissions": [
        "storage",
        "activeTab"
    ],
    "action": {
        "default_icon": {
            "16": "img\/16-icon-monochrome-on.png",
            "32": "img\/32-icon-monochrome-on.png",
            "48": "img\/48-icon-monochrome-on.png",
            "128": "img\/128-icon-monochrome-on.png"
        },
        "default_title": "Monochrome Mode"
    }
}