Switch tabs in Chromium every 8 seconds and reload specific tabs [tabs] only at specific times [times] and in less than 60 seconds

timer.sh

#!/bin/bash
#set -xv
DISPLAY=:0.0
export DISPLAY=:0.0
export XAUTHORITY=/home/pi/.Xauthority

m=0
action=""
min=$(date +"%M")
times=(00 05 10 15 20 25 30 35 40 45 50 55)
tabs=(2 3 5)
if test $(cut -d '.' -f1 /proc/uptime) -gt 60; then 
        if pidof -o %PPID -x "timer.sh">/dev/null; then 
                #echo "Process already running"
                exit;
        else
                start=0
                end=0
                for i in {1..7}; do
                        if [ $m -lt 52 ]; then
                                start=$(date +%s)
                                if [[ ${times[*]} =~ (^|[[:space:]])"$min"($|[[:space:]]) ]]; then 
                                        if [[ ${tabs[*]} =~ (^|[[:space:]])"$i"($|[[:space:]]) ]]; then
                                                action="ctrl+$i ctrl+r"
                                        else
                                                action="ctrl+$i"
                                        fi
                                else 
                                        action="ctrl+$i"
                                fi
                                wmctrl -xa chromium-browser.Chromium-browser && xdotool search --class Chromium key --window %@ "$action"
                                sleep 8.3
                                end=$(date +%s)
                                seconds=$(($end-$start))
                                ((m=m+$seconds))
                        else
                                exit;
                        fi
                        if [ $m -gt 58 ]; then
                                exit;
                        fi
                done;
        fi
fi