Script to send a F5 key press to the foreground app, if this is Chromium it will refresh the page.
Requires xdotool:
sudo apt-get install xdotool -y
NOTE: Assumes second browser is at 1930,10
Create a script:
sudo vi /opt/scripts/chromium-refresh-two-browsers.sh
#!/bin/bash
export DISPLAY=:0.0
export XAUTHORITY=/home/pi/.Xauthority
# Screen/browser 1
/usr/bin/xdotool mousemove 10 10 click 1
/usr/bin/xdotool key F5
# Screen/browser 2
/usr/bin/xdotool mousemove 1930 10 click 1
/usr/bin/xdotool key F5
Update the permissions
sudo chown pi.pi /opt/scripts/chromium-refresh-two-browsers.sh
sudo chmod u+x /opt/scripts/chromium-refresh-two-browsers.sh
sudo chmod +x /opt/scripts/chromium-refresh-two-browsers.sh
Test:
/opt/scripts/chromium-refresh-two-browsers.sh