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That's really sad, no statement yet.
In addition, since the last update the MacOS App "Magnet" ist not working with Opera anymore,
so I need to change the window size and rearrange browser windows manually now.
Because MacOS doesn't bring any usable function that automatically attaches windows to corners out of the box, the whole workflow with Opera is now gone.
Despite I love the functionalty and the speed of Opera, all these issues force me to switch to Firefox now 
@sgunhouse I have to disagree on that. With the Workaround of the Logitech Software setting, the backbutton on the mouse is now working, BUT the "focus bug" of the Opera Window still remains since half a year now. For example I am using the app "Magnet" to quicklyput windows on predefined corners of the screen, but with opera this only works if i have a single Opera Window opened. As soon I open a second Opera window, it doesn't work anymore and i have to close the browser. If i want to have to windows side by side I now have to use firefox on macos. The back and forward buttons and the app "Magnet" as well as other apps that help managing windows definitly worked with Opera 59 and lower (without any workarounds).
@sgunhouse I have to disagree on that. With the Workaround of the Logitech Software setting, the backbutton on the mouse is now working, BUT the "focus bug" of the Opera Window still remains since half a year now. For example I am using the app "Magnet" to quicklyput windows on predefined corners of the screen, but with opera this only works if i have a single Opera Window opened. As soon I open a second Opera window, it doesn't work anymore and i have to close the browser. If i want to have to windows side by side I now have to use firefox on macos. The back and forward buttons and the app "Magnet" as well as other apps that help managing windows definitly worked with Opera 59 and lower (without any workarounds).
That's really sad, no statement yet.
In addition, since the last update the MacOS App "Magnet" ist not working with Opera anymore,
so I need to change the window size and rearrange browser windows manually now.
Because MacOS doesn't bring any usable function that automatically attaches windows to corners out of the box, the whole workflow with Opera is now gone.
Despite I love the functionalty and the speed of Opera, all these issues force me to switch to Firefox now