Prevent duplicate tabs

1. How do I prevent duplicate tabs in Chrome?
2. Why does my tab keep duplicating?
3. Is it possible to lock tabs?

How do I prevent duplicate tabs in Chrome?

Add “Unique Tabs” to your Chrome to suspend duplicate tabs upon opening a new tab or navigating to a new page. As compared to other extensions, Unique Tabs displays a notification before closing tab. Clicking “Cancel” in the notification within a delay of 5 seconds will prevent the tab from being closed.

Why does my tab keep duplicating?

Chosen solution

If "Show tab previews in the Windows taskbar" is turned on, instead of having one entry per window, you get one entry per tab. Uncheck that to turn it off.

Is it possible to lock tabs?

Lock Tab. Adds a padlock icon that allows toggling each tab's lock/unlocked state. When a locked tab is being closed, a confirmation dialog which allows preventing the tab from closing, is displayed.