Starting Opera 37, the Opera software incorporated and enabled Evaluate opera dialog across all channels such as developer, beta and stable. Sometimes the Rate Opera dialog might accidentally pop up and ask the user to send feedback, so you can rate, leave your comment and submit, or you can close this dialog. You can also disable the rate opera dialog from appearing in the future again, here’s how it can be done.
Disabling the Rate Opera dialog box
- Visit opera://flags/?search=rate#rate-opera
- Select Disabled and restart the Opera browser.
READ: How to disable Heartbeat Feedback feature in Firefox 37?