bin/throttle at master · kahing/bin · GitHub

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#!/bin/bash

pid=$(xdotool search --onlyvisible --class firefox getwindowpid)

function do_throttle
{
    sleep 3
    echo "STOP $pid"
    kill -STOP $pid
}

function do_unthrottle
{
    echo "CONT $pid"
    kill -CONT $pid
}

throttled=0
while true; do
    activepid=$(xdotool getactivewindow getwindowpid)
    if [ "$activepid" = "$pid" ]; then
        if [ $throttled = 1 ]; then
            do_unthrottle
            throttled=0
        fi
    elif [ $throttled = 0 ]; then
        do_throttle
        throttled=1
    fi

    if [ $throttled = 1 ]; then
        for i in $(seq 1 100); do
            sleep 0.1
            activepid=$(xdotool getactivewindow getwindowpid)
            if [ "$activepid" = "$pid" ]; then
                break;
            fi
        done
        do_unthrottle
        throttled=0
    fi

    sleep 1
done