From September 13th, 2020 to October 15th, 2020, 100% user give 5-star rating. for cronTab chrome extension.
works as decribed!!
Works pretty good and opens the URLs on time. The minutes seem to work fine. I haven't really tested day of week. Hours seem to observe specific hour, but I can't get it to repeat every 4 hours using */4. Not sure why but some URLs are opening up more frequently than I want. Otherwise, its really the one extension I've tried that actually works. The other cron extensions seem like half baked ideas or don't really work like cron.