The new noRecaptcha/noCaptcha (click on “I’m not a robot” & “Click on images”) can only be automatically solved by 2captcha. If you did not set this as first service, you will get manual captcha solving for the sites where the noRecaptcha is found.
In this case, or if you want to manually solve captcha’s and you encounter the new noRecaptcha, a browser will popup along with instructions. You will have to click the images as instructed. After successfully solving the captcha, the browser will disappear and the process will continue silently.