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how to stop unwanted new tabs in chrome

To Stop Automatic Tabs Opening in Google Chrome
1. Clear Cookies.
2. Check Extensions.
3. Prevent Automatic Tabs Opening with AdLock.
4. Turn on Pop-Up Blocker.
5. Scan for Malware.
6. Update Chrome to the Latest Version.

Might also check background apps cause chrome supports many apps that can run in the background. That might be the reason why chrome opens new tabs.