@spale On desktop systems, you can use any image found on the page or a screenshot. When you visit the page, click on the heart icon in the address bar. From the pop-up you can change the speed dial image by clicking the arrows left and right of it.
@lafwan Did you download Opera from the official site? If so, then it's probably only a false positive.
Sorry for the late replay. Yes I have download Opera GX from the official website https://opera.com I don't know if the problem still exist since I stopped using it