Get RSS Feed URL for Slick RSS

{
    "update_url": "https:\/\/clients2.google.com\/service\/update2\/crx",
    "manifest_version": 3,
    "name": "__MSG_appName__",
    "description": "__MSG_appDesc__",
    "version": "1.1.1",
    "author": "__MSG_appAuthor__",
    "homepage_url": "https:\/\/github.com\/gandf\/get-rss-feed-url-extension-for-slick-rss",
    "options_page": "options.html",
    "default_locale": "en",
    "permissions": [
        "activeTab"
    ],
    "host_permissions": [
        "http:\/\/*\/*",
        "https:\/\/*\/*"
    ],
    "action": {
        "default_icon": "img\/icon_default.png",
        "default_popup": "popup.html",
        "default_title": "__MSG_appTitle__"
    },
    "background": {
        "service_worker": "js\/background.js"
    },
    "icons": {
        "128": "img\/icon_128.png"
    }
}