When Auto Refresh's Detect Keyword feature finds a matching word on the page, it can alert you in two ways: a desktop pop-up box from the operating system, and a sound played in the tab. If you want sound alerts only — and no visual pop-up — there is a single checkbox that controls the desktop notification.
The option is stored per browser profile, so a freshly installed copy of Auto Refresh starts with the desktop notification enabled until you turn it off. That is also why the same installation can behave differently across separate browsers or profiles.
Follow This: https://auto-refresh.extfy.com/en/sound-alerts.html

Detect keyword on page
Play sound when keyword detected
Notify the user
If desktop notifications still appear after saving, check the browser-level notification permission for the extension and confirm the setting has actually saved — the indicator at the top of the popup should display "Save" greyed out when there are no pending changes.
Learn how to automatically refresh a page on Edge using the Auto Refresh Edge extension. This step-by-step guide shows how to set custom refresh intervals, auto reload web pages, and keep content updated without manually refreshing your browser.