I have no idea what the combination is because I've only ever accidentally hit it, but I've hit it a couple times now. It closes every single open browser window and opens up an old window that had been closed minutes if not hours earlier. Without any confirmation whatsoever. It just happens.

I have lost work because of this.

Oh my god I'm such an idiot.. I didn't even know panic mode was a thing.

I think my confusion stemmed from the fact that all my open tabs disappeared from the taskbar as well. I figured they were closed, not just hidden. I've also never set any panic mode options, so I think maybe it just grabbed a random URL from browsing history for the new window?

Anyway, thank you very much for the information! I respectfully withdraw my request sir. I'm not sure how I fat-fingered F12, but that's the behavior for sure. It's Opera GX on Windows 10 Pro, in case you still want that information.

Oh my god I'm such an idiot.. I didn't even know panic mode was a thing.

I think my confusion stemmed from the fact that all my open tabs disappeared from the taskbar as well. I figured they were closed, not just hidden. I've also never set any panic mode options, so I think maybe it just grabbed a random URL from browsing history for the new window?

Anyway, thank you very much for the information! I respectfully withdraw my request sir. I'm not sure how I fat-fingered F12, but that's the behavior for sure. It's Opera GX on Windows 10 Pro, in case you still want that information.

I have no idea what the combination is because I've only ever accidentally hit it, but I've hit it a couple times now. It closes every single open browser window and opens up an old window that had been closed minutes if not hours earlier. Without any confirmation whatsoever. It just happens.

I have lost work because of this.

I believe both Chrome and Firefox allow for docking/placement of a separate tabbed window into an existing tabbed window as soon as one drags any tab to the titlebar, instead of how Opera handles it by forcing one to precisely drag the tab right next to an existing tab. The former method is much easier and convenient than the latter.