Shows another message instead, even on pages without the cookie nag:

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How to disable original Opera's horizontal tab bar?

Holy crap, what a torture to login to comment on something here. I had to register despite having registered in 2004, then I had to agree to some privacy bs and agree with receiving spam, then I had to confirm email TWICE because first confirmation did not come. Now after 15 minutes of bureaucracy I can finally post a comment:
Very easy to delete a proxy with all rules. One accidental clicking Delete button removed everything without any questions.