The alert is from a part of your avast av solution that is called “browser clean-up”, used to detect and uninstall unwanted browser extensions.
Why this part of the av solution flagged this? Probably particular privacy intrusion reasons or the extent as what the extension can do inside the browser.
The decision to uninstall is yours. “Unwanted” is a term denoting a probable risk, but it does not mean the extension “an sich” is suspicious or malicious, else Google development would not allow it on.
polonus