The Opera browser, when you search in the search bar keeps changing the default engine to https://www.google.ch!!! I've changed it to duck duck go every single day, multiple times per day and it keeps changing back. I suspect it has something to do with the Chinese consortium that recently acquired Opera and began breathing life into it. However, because of this I have to wonder what else this %&% browser does behind my back!
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From @kreezxil