Close Duplicate Tabs

{
    "update_url": "https:\/\/clients2.google.com\/service\/update2\/crx",
    "$schema": "https:\/\/json.schemastore.org\/chrome-manifest",
    "action": {
        "default_icon": {
            "16": "\/images\/icon-16.png",
            "32": "\/images\/icon-32.png",
            "48": "\/images\/icon-48.png",
            "128": "\/images\/icon-128.png"
        }
    },
    "background": {
        "service_worker": "background.js"
    },
    "default_locale": "en",
    "description": "__MSG_extensionDescription__",
    "icons": {
        "16": "\/images\/icon-16.png",
        "32": "\/images\/icon-32.png",
        "48": "\/images\/icon-48.png",
        "128": "\/images\/icon-128.png"
    },
    "manifest_version": 3,
    "name": "__MSG_extensionName__",
    "permissions": [
        "tabs"
    ],
    "version": "3.1.0"
}