Here is the suggestion in the official issue tracker:

https://opera.atlassian.net/servicedesk/customer/portal/9/BS-63733

@willowthefuta Nope.

I'd agree with @leocg. One of my classmates downloaded one of those and actually it was a virus. Most of them are viruses. He had to call IT to get it off.

@kklepper Don`t know why but I would guess it was due to conflict with Opera design.

You cam always ask for the feature to come back.

@burnout426 Oh awesome, thanks! Thought it was already possible with default chrome, didn't even think of looking for an extension.

@leocg Oh my, well now I feel foolish 😅 guess I learned something new today. Please disregard my suggestion. I did not know chrome based browsers already did that.

You have to shift back to chrome for this function because in opera it is not supported. In chrome, you can perform this task easily.

I indeed have the default gestures, so I cannot comment on custom ones. 😞

Ok, so let me ask this, instead. I gather, from the lack of any responses and my own searching, that there is no extension that does what I need. So I'm willing to try and do one, myself. There's just one thing I haven't been able to find (or know that I've found it in a list of extensions related to bookmarks): how to basically intercept a user opening a bookmark, whether it be in bookmarks, the bookmarks toolbar, etc., and, using code that I have found, open that bookmark in a new tab? I just need to know how to see that click on any/all bookmark(s) and act on it. Suggestions? Thanks.

@leocg i tried going through all my settings because the only extension i have is the Opera adblocker and turning that off didnt work.

I don't know what happened or what I did, but now Opera doesn't crash

The only thing I changed that I didn't change back was the prediction fill for the search bar

@Repter As I see on the extension support page in the Chrome Store, the developer knows about the problem in Opera. You need to wait for the next version of the extension in the Chrome Store or use the old version.

Also good:
Tab Position Customizer - Modified

But the opening of new blank tabs lasts very longer done by Strg+T than by context right click on the tabs bar.
WHY??
And with the addon Vimium closing of a tab by key x is very faster than the built in method. Why?

What about keyboard shortcuts please?

Yes, indeed it does, thank you! It appeared that I have to hold the wheel being pressed for the very long time (a couple of secs perhaps) to make a click successfuly. Guess I need another mouse, thought of Logitech better