'Sent to' Email Copier

{
    "update_url": "https:\/\/clients2.google.com\/service\/update2\/crx",
    "name": "'Sent to' Email Copier",
    "version": "1.0.7",
    "description": "Copies email adress of who the email was sent to",
    "permissions": [
        "tabs"
    ],
    "host_permissions": [
        "https:\/\/mail.google.com\/mail\/u\/*"
    ],
    "background": {
        "service_worker": "background.js"
    },
    "content_scripts": [
        {
            "matches": [
                "https:\/\/mail.google.com\/mail\/u\/*"
            ],
            "js": [
                "contentScript.js"
            ]
        }
    ],
    "web_accessible_resources": [
        {
            "resources": [
                "assets\/copy-32.png"
            ],
            "matches": [
                "https:\/\/*.mail.google.com\/*"
            ]
        }
    ],
    "action": {
        "default_icon": {
            "16": "assets\/copy-16.png",
            "24": "assets\/copy-24.png",
            "32": "assets\/copy-32.png",
            "128": "assets\/copy-128.png"
        },
        "default_title": "Sent to email copier"
    },
    "icons": {
        "16": "assets\/copy-16.png",
        "24": "assets\/copy-24.png",
        "32": "assets\/copy-32.png",
        "128": "assets\/copy-128.png"
    },
    "manifest_version": 3
}