For example I have greasemonkey sript like this
Download YouTube Videos as MP4
https://greasyfork.org/en/scripts/1317-download-youtube-videos-as-mp4
I want to run this greasemonkey srcipt at the special time in firefox with crontab. for example i want to create this task in crontab in linux and I've tested this command but I think this is wrong
0 18 * * * export DISPLAY=:1 && firefox && greasemonkey --Download YouTube Videos as MP4
What is the correct command?