Service Worker & Browser Notifications
If — and only if — you turn on browser notifications from Notification Settings in the portal, two further things happen on your device. Neither is enabled by default, and neither happens for a visitor who never switches them on.
Service worker
A small script installed in your browser
Your browser installs /sw.js, a script that stays registered after you close the tab. It exists so a notification can be shown when the portal is not open. It does exactly three things: display a notification we send, open the portal at the right page when you click one, and re-register your subscription if your browser rotates it. It does not cache pages, does not track you, and does not run when there is nothing to show.
It is removed when you turn browser notifications off in the portal, and you can remove it yourself at any time from your browser's site-settings or storage panel.
Third-party recipients
Your browser's push service receives the message
Web push does not travel from us to you directly. Every browser delegates delivery to a push service run by its maker, and your browser chooses which one — we cannot. When you subscribe, your browser gives us an address at one of these services, and we send each notification to that address:
What the push service can see, stated precisely: the address it issued for your browser, the fact that we sent something to it and when, how long we asked it to hold the message, and a contact address for us (support@pronovatech.com) that identifies Pro Nova rather than you. It cannot read the notification. What we hand it is the notification — its heading and text, which for a device alert names the device concerned — sealed before it leaves us with keys your browser generated and never shared with the push service, so it passes through as unreadable bytes and can be opened only by the browser that subscribed. Nothing else is attached to it: not your name, not your email address, and no account or device record beyond whatever the notification itself says.
Turning browser notifications off in the portal unsubscribes your browser and deletes the stored address. If instead you block notifications for this site in your browser, nothing further is displayed to you; the stored address is then removed the next time your browser's push service tells us it is no longer in use.