Until Opera 60.0.3255.27 the behavior was as expected: You "minimize" Opera with the red button and it will be (active) in the dock. Click the Opera-Icon in the dock again and it will open instantly a new window. That's what I want. With the latest Opera ..... .65 a click on the (active) Opera-Icon in the dock causes... nothing. The Opera app appears in the menu bar without a new window, you have to click inconvenient "Open a new window" or "Open a new tab" in the (context)- menu.

Normal when choosing, overlapping in Speed Dial, no matter if small or big

Sorry, this won't help you, but I never had this problem with Opera. My speed dial tiles are always in the same order I wanted and never shifted. It must be some preference that not works well.

Updated to the latest Opera build and noticed, that Opera will not restore to a window, when it was minimized with the red button (macOS 10.14.4).
That's annoying. I had to minimize it with the yellow button....
Anyone else?

@hyun-shik said in Why is the Extensions button in the address bar useless?:

I also already know what extensions are active because they show up in the address bar.

This is exactly the purpose of this button: With it you can control which extensions you want to have displayed there. If you pin an extension, it always stays in the menubar, if not, it disappears again when you restart Opera (you have to reposition it).

How about download the latest Opera for your system from the Opera homepage and install it?

@yunhi Something seems to be going wrong with your system. I also have "Adguard for Mac" running (system-wide) and it works fine with the latest Opera.
macOS Big Sur 11.2.3
Opera 75.0.3969.93 (x86_64)
Adguard for Mac 2.5.3.955
AdGuard Browser Assistant Beta 1.1.11 (Extension)

Two? Even if one includes the number of unreported cases, the problem does not seem to be widespread. Here in a forum, people who have problems get in touch. Those who don't have any will hardly ever get in touch.
I'm just bothered by the thought that a bug that relatively few people have is stylized into a general problem that "must" affect all Opera users. So the statements and partly spiteful answers in this thread reach me.
There seems to be an Opera problem that does not affect all users and probably in connection with other system settings that you are probably not even aware of.
I know that this answer is not too helpful for this problem, but it had to be said.

If it were a pure Opera problem, most people would probably have the same problem you mentioned. But it doesn't seem so, otherwise your thread would probably "overflow”.
I don't doubt that you have a problem with Opera, but as I said before, it's probably not just Opera. Unfortunately I can't help you, because I can't reproduce your problem. It is not said that all extensions "work" identically in all browsers. The substructure might not be the same. For example, extensions from the Chrome Web store under Opera sometimes have limited functionality. This is also mentioned by Opera when you load an extension for Opera which is actually intended for Chrome.
By the way: Do you still have this bug with the latest Opera version 72.0.3815.200?

Please don't conclude from your problem to all Opera users: Here Opera (latest version) runs without problems, fast and smoothly. I don't think that Opera alone is the problem...

Simply open a desired page, copy the address, click on "+ Add..." on the speed dial page and paste the copied page. Done.

I strongly assume that "home page" means "speed dial". Probably you deactivated it yesterday by mistake. You can enable speed dial again in the settings. You might have to put them together again.

Here no problem to open your linked page. The graphics are visible and the map is zoomable. No pop-up window.
macOs Catalina 10.15.7, Opera 72.0.3815.148

I have never experienced anything like this before. How about a good adblocker...?