MergeMail

{
    "update_url": "https:\/\/clients2.google.com\/service\/update2\/crx",
    "name": "MergeMail",
    "short_name": "MergeMail",
    "version": "1.5.2",
    "manifest_version": 3,
    "description": "Mail merge for Gmail",
    "icons": {
        "16": "img\/icon16.png",
        "48": "img\/icon48.png",
        "128": "img\/icon128.png"
    },
    "homepage_url": "https:\/\/www.mergemail.co\/",
    "action": {
        "default_title": "MergeMail",
        "default_icon": "img\/icon.png",
        "default_popup": "popup.html"
    },
    "background": {
        "service_worker": "background.js"
    },
    "content_scripts": [
        {
            "matches": [
                "https:\/\/mail.google.com\/*"
            ],
            "css": [
                "css\/content\/style.css"
            ],
            "js": [
                "js\/content\/jquery.js",
                "content.js"
            ],
            "run_at": "document_end"
        }
    ],
    "externally_connectable": {
        "matches": [
            "*:\/\/www.mergemail.co\/*"
        ]
    },
    "permissions": [
        "scripting"
    ],
    "host_permissions": [
        "http:\/\/mail.google.com\/*",
        "https:\/\/mail.google.com\/*",
        "https:\/\/www.mergemail.co\/*"
    ],
    "web_accessible_resources": [
        {
            "resources": [
                "*.map",
                "img\/*",
                "js\/vendor\/jquery-2.0.3.min.js",
                "frame.html",
                "frame_loading.html"
            ],
            "matches": [
                "https:\/\/mail.google.com\/*"
            ]
        }
    ]
}