With a couple of browser settings, you can modify Kopernio's behaviour.
In Chrome, a right-click on the Kopernio icon will bring up a list of actions. If you select 'Manage Extensions', you will be redirected to Kopernio's browser settings page.
If you select 'on click' activation, Kopernio will be idle on all websites until you click the small green icon next to your browser's address bar.
Another option is to specify a list of websites where Kopernio should always activate. You will need to paste the URLs in the selection bar.
To disable the plugin, click the blue toggle (as seen on the below screenshot).
In Firefox, a right-click on the Kopernio icon will offer the same 'Manage Extensions' option.
You will now be able to disable the plugin.