I use Firefox, and my shortcuts are shift + alt + S. So, a little more work, but it should work as long as you have the language setup correctly. Obviously, to preview it would be shift + alt + P. Do note, it's not Alt Gr, it's the left hand alt that's oriented on your keyboard. As far as I know, it's handled by the browser more than the OS that the browser is on, but just for covering all basis' I'm running Linux, inside Qubes OS. However, like I said it shouldn't make too much difference what OS your using. if it does like loyceV suggests then, just take a look at your keybindings on the OS, and see if you can figure out the corresponding one based on the answers here.
I'm running a fairly modified Firefox, especially via policies, but it shouldn't affect the keybindings.
I just tried it and doesn't work on my device. For reference i tested it with Tor Brwoser on Linux, although i don't know keyboard setting on my OS.
Have a look at your settings on your distribution, it'll vary depending on which one you have. As for Tor, I can't see it acting any differently to the default Firefox, as long as the same language is being used.