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i seems to have a permanent exception entry which i didn't add for the built-in ad blocker on youtube.com.
i can't get it off the exception list at all. is this intentional??
tried adding other websites and was able to successfully undid the entry.
The 4 only default exceptions are Baidu, Google, facebook and Yandex. You should be able to remove any of them.
Try deleting adblocker_rules.json from Opera's profile folder so a new one will be created.