I want all images in YouTube to change to a.jpeg.

JS code:

const imgs = document.getElementsByTagName('img');

for (image of imgs) {
    image.src = "a.jpeg";
}

Manifest.json code:

{
    "manifest_version": 3,
    "name": "BwnnyRxbbit Everywhere",
    "version": "1.0.0",
    "description": "Puts BwnnyRxbbit's pfp everywhere",
    "content_scripts": [
        {
            "matches": ["https://www.youtube.com/*"],
            "js": ["script.js"]
        }
    ]
}