Yes, this is happening to me too in Manjaro Arch Linux , Opera Version: 66.0.3515.27.
I downgraded to 64.0.3417.92 it looks more stable.
This problem is old to me, older versions have issues in taskbar too.
Seem like something about the extensions but I think this is more about Opera then it...
Best posts made by nickcagenick
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RE: Opera lock up randomly every 5 to 10 seconds (66.0.3515.27)Opera for Linux
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Overlay Scrollbar Removed??Opera for computers
What do you did guys? Why? This flag is the best one, and If you are tring to be better then chrome firefox and edge, I think you have to keep the best functions of chrome not simple copy they steps.
Someone tried some solution to enable again?
I tried in command-line (linux/unix) =opera --enable-features=OverlayScrollbar,OverlayScrollbarFlashAfterAnyScrollUpdate,OverlayScrollbarFlashWhenMouseEnter
Don't work but in Chromium works...
Opera 66.0.3515.27