Lemview: Preview Message & Read time in Mails

{
    "update_url": "https:\/\/clients2.google.com\/service\/update2\/crx",
    "name": "Lemview: Preview Message & Read time in Mails",
    "description": "Arrange your gmail inbox to display the number of lines needed and get the reading time and word count of the email",
    "version": "1.0",
    "icons": {
        "128": "assets\/icon128.png"
    },
    "action": {
        "default_popup": "popup.html",
        "default_title": "LemView"
    },
    "content_scripts": [
        {
            "matches": [
                "https:\/\/mail.google.com\/*"
            ],
            "js": [
                "content.js"
            ],
            "run_at": "document_end"
        }
    ],
    "background": {
        "service_worker": "background.js"
    },
    "permissions": [
        "scripting"
    ],
    "host_permissions": [
        "https:\/\/mail.google.com\/"
    ],
    "manifest_version": 3
}