@myswtest You are showing the main window, in which the developer tool is docked. Click the ... button on the top-right and make it a separate window.
Also, if you are using KDE, this problem may not exist, because, if I know it correctly, KDE supports server-side decoration. Gnome does not support it, so Wayland applications need to provide the window title bar on its own.
Upd. Add 30 cores to VM. Similar behavior: cores used at 60-90%, network at 8 mbit/s.
I see icons at horizontal tabbar, but not in "vertical tabs". Did you know the extension, which shows icons of snoozed tabs?
@fonm
your suggestion doesn't fix the "post-handshake" error with TLS 1.3, and in addition causes many other websites (including This one!) to fail, because they are not running TLS 1.3.