Signal process by name. Mostly used for stopping processes. More information: https://www.manned.org/pkill.
pkill "{{process_name}}"
pkill {{[-f|--full]}} "{{command_name}}"
pkill -9 "{{process_name}}"
pkill -USR1 "{{process_name}}"
firefox process to close the browser:pkill {{[-o|--oldest]}} "{{firefox}}"