On demand? Doubt it. Of course you could try moving your profile to see if it works then - that is, rename both your roaming and local profiles so that Opera thinks it is a new install. Though one of the Notes extensions might do that also.
Google is working on a solution to block crypto currency miner in Chrome:
So it may find its way into Opera too?!
I can second this.
I've installed Opera Browser and Opera Mini (both for Android) and it seems that Opera Browser builtin adblocker doesn't work, even though it's already activated in Data Saving menu. Opera Mini adblocker, on the other hand, works normally.
Try this. Open up the website you want to have multiple bookmarks for. Bookmark it to one of the locations in which you want it. Then open the full bookmarks listings (Show All Bookmarks). Find the bookmark you have made and right click your mouse and click copy. Then open the other folder in which you want a copy of the bookmark and paste it there.