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Download Opera browser with:
OS: Win 10 Home
Any webpage with Recaptcha widget on it, http://www.google.com/recaptcha/api2/demo for example.
Other browsers (like Chrome/Firefox/Safari) have a clean console log w/o any errors.
Opera has errors in its script.
Latest version of Opera, I get 2-3 errors (pic related) in browser's console for every ReCaptcha on webpage, why does it happen?