Some keyboards have their F1-F12(function keys) combined with other keys, and you'll find them printed in a usually smaller font on keycaps. Press them together with Fn key would work. Besides, you can get a keyboard with standard  function keys and plug it to your computer. If you are using a macbook with a touchbar, you might need to press and hold the Fn key to make function keys show in the touchbar.
Force quiting the browser might also work. For windows, press Ctrl+Alt+Delete to open the task manager. For MacOS, press Option (or Alt)+Command+Esc (Escape) to open the Force Quit window.
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