I needed another auto-reloader, so I decided to give this a try, even though in the description it sounded a not so good idea (reloading based on URL, instead of tab id.) It has no [Apply] button or anything, so I was never sure the period was set or the add-on was active for the tab/URL (even though the period set reappeared when I reopened its pop-up). Anyway, nothing ever happened, no reloading, no nothing...