Works as expected, using it to open certain tabs to remind myself to go to bed. Cron expression explainations are also straightforward

It doesn't work correctly. The same Chrome plugin works fine. This one doesn't. For example, I set it to open a page every day at 6:00 a.m. I launch Chrome at 8:00 a.m., and the page opens. I launch Firefox with the same configuration, and the page only opens if I have the browser open at 6:00 a.m. If I launch it later, a page won't open at all.