I think you are looking for an auto-clicking program like GS Autoclicker but I am not sure if they are compatible with opera? It works fine in games for sure.
Latest posts made by vince77
RE: How do I set a web page to auto refresh in Opera?Lounge
RE: Freezing when cancelling downloadsOpera for Android
Sometimes I face that issue too. But I simply close the browser and restart it and everything is fine. I think it is more of a device issue because on my other mobile it never happened. Or it could be the website from where you are downloading it( Could be malicious).
RE: [Solved]Previous copied link showing up in address/search barOpera for Android
You can try to clear your bookmarks, History. This might help. That's the only logical thing I can think of.