Hey, dev team! Opera has been causing a lot of crashes on my system lately (Ubuntu 17.10, Xorg - not Wayland). I don't know how to reproduce the bug, it seems random, but here's how it behaves.
When switching to Opera from another window, or when opening a new Opera window (not launching the browser, but opening a new window), or when selecting a running instance of Opera from the Application overview, the whole Ubuntu UI freezes in place. I can still move the mouse cursor and my PC continues working, e.g. music or videos keep playing, but the UI is frozen and unresponsive. The clock in the top bar tops ticking, too. It's like a screenshot.
The only fix I have found is pressing my computer's reset button.
I wasn't able to find any pattern to this, but it always happens when I do something with Opera.
Can you try to address this bug? I love Opera, but I'm gonna have to go back to Firefox for the time being. I hope I can return to this browser soon.