Select each of these processes and then click on the Quit Process button that is found in the toolbar. Once you launch the app, go to the Processes tab, and find all the processes that have “Opera” in their name.
This can be done from the Activity Monitor app that is found in Applications>Utilities>Activity Monitor.
To ensure the smooth removal of the browser, make sure that you quit Opera if it is operating and end any processes that are related to it.
