About shows the path as ... Cache: C :\Users\Owner\AppData\Local\Opera Software\Opera Stable.

Where in that directory is the actual cache? What is its name?

And by the way, opera:cache does not work. What is the new command?

I'm not sure if this is what you want, but try, "Right Click Opens Link New Tab Correct Order" from the Chrome Store.

The only viable option that I can think of is right-click, Full Screen. To return to normal, right-click and exit full screen.

I realize this does not answer your original question, but is it a work-around?

May I politely suggest, (again), that when you remove an inappropriate topic, there is no need to say this topic is deleted.

It serves no useful purpose.

There is a Chrome extension available that might help ... "Right Click Opens Link New Tab Correct Order".

My apologies if this has been asked before. I have two main browsers; Opera and Firefox.

Firefox has some updated bookmark entries that I do not have in Opera.

If I re-import the bookmarks from Firefox, does Opera start over, so to speak, or will I have duplicate entries?

OP ... I'm running the latest version of Opera on Windows 10. It's as fast as Firefox, if not faster.

Have you done a system scan for possible malware? (try Malwarebytes and SuperAntiSpyware).

Also check to see in the system Task Manager what other (unnecessary) applications may be running.

@gokuluffy ... Agree. This is really getting annoying.

Found the problem. The extension User-Agent Switcher was turned on.

My thanks to all that replied.

YOUR BROWSER SCORES 501 OUT OF 555 POINTS
You are using Opera 48.0 on Windows 10

I am on Version 58.