One-Click Gmail Template

{
    "update_url": "https:\/\/clients2.google.com\/service\/update2\/crx",
    "manifest_version": 3,
    "name": "One-Click Gmail Template",
    "version": "1.1",
    "description": "Insert pre-saved email templates into web-based email clients with one click or add templates from Gmail emails.",
    "permissions": [
        "activeTab",
        "storage",
        "contextMenus",
        "scripting"
    ],
    "icons": {
        "16": "images\/icon16.png",
        "48": "images\/icon48.png",
        "128": "images\/icon128.png"
    },
    "host_permissions": [
        "https:\/\/mail.google.com\/*"
    ],
    "content_security_policy": {
        "extension_pages": "script-src 'self'; object-src 'self'"
    },
    "background": {
        "service_worker": "background.js"
    },
    "action": {
        "default_popup": "popup.html"
    },
    "content_scripts": [
        {
            "matches": [
                "https:\/\/mail.google.com\/*"
            ],
            "js": [
                "content.js"
            ],
            "run_at": "document_end"
        }
    ]
}