Ok, @eson, try this mouthful of command at the end of the script
notificationtool -o add -a "restart;Restart org.freedesktop.systemd1 /org/freedesktop/systemd1 org.freedesktop.systemd1.Manager RestartUnit booster-browser@sailfish-browser.service replace" "Adblock Hosts updated" "Click Restart to restart browser." -A hosts-block -I icon-l-calendar-cancelled
This does not restart the browser, but shows a notification that kills it if you so wish, you restart it yourself.