If you're using GNOME 3, pressing Alt+Ctrl+Shift+R screen recording will start. There should be a red icon on the message tray in the right-bottom corner of you

If you're using GNOME 3, pressing Alt+Ctrl+Shift+R screen recording will start. There should be a red icon on the message tray in the right-bottom corner of your screen. If the message tray is hidden, Super+M will activate it. Pressing the red icon will stop the recording. Posting the videos of Chrome vs Firefox Quantum somewhere like YouTube might be an interesting thing to watch.