Bubble - Prevent Duplicate Windows/Tabs Plugin
This plugin allows you detect if a user has opened more than one window/tab within your website at the same time. Once a new tab/window is detected, an event is triggered. You can show a popup, alert or block access to your page's content.You can also choose whether or not the window/tab should automatically close and set the delay.
Simply drag the duplicate window element onto the page you want the effect to apply. If a duplicate window/tab is detected, the "A duplicate tab has been detected" event is triggered. You can access this event within a workflow and show an alert, popup etc. Furthermore, you can also specify if the window/tab should auto-close once a duplicate window/tab has been detected. If you check this box, you can also specify the delay in milliseconds until the window/tab is closed.