"Worthless" is pretty subjective, there are countless other users who'd testify differently. It is not appropriate to downvote an addon just because it is not useful to you personally, whereas it works as intended. Nevertheless, the Remember Page option might do what you want.

Hi, enable Sticky Reload and disable Smart Timing (latter might not be needed). You can make these the default options in the add-on settings. FAQ has explanation.

Hi, no other reviewer ever reported the reload not working, and I also don't know of any situation where it shouldn't. Please have a look at the FAQ included in the new version, maybe it will help solve your problem. Otherwise, can you please give me the URL where it doesn't work? I'd be glad to investigate if there is really a problem with the add-on.

EDIT: Should now work after form submissions.

Old Answer: Note this only happens for pages with POST data, and automatically refreshing such pages is potentially dangerous! Firefox is showing you that warning for a good reason. If the addon is otherwise working as expected, a 1-star rating (as opposed to subtracting 1 or 2 stars for a missing feature) is a bit unfair just for not letting you shoot yourself in the foot. I'll see if I can implement support for this though, and let you know here in the comments.