VideoDownloadHelper is, conceptually, a great add-on for Firefox. I feel, however, that the product (sadly) still has some further thought needing to be put behind it to turn it into the kind of download helper that it could, and, should be.
When it works, it usually works well. Sometimes, however, for no reason, it does not work.
My biggest gripe, actually, is that the functionality is very esoteric / arcane in that the developer, even with the right intentions, has not "translated" the functionality into something that is easy to use / intuitive / friendly. Frankly, I find this a bit odd -- how does one not find out from potential users what their issues are, etc.?
There are still quite a few aspects to this add-on that, frankly, I have no clue about, and, can't make sense of. And, by the by, I'm an above-average tech user, so, I SHOULD be able to follow the logic easily.
So, so ... not meaning to be harsh. This product, 70% of the time, is very useful. I urge the developer, though, to elevate this app to a "100-percenter" which would be amazing, and, which would become a major money-spinner for said developer. Right now, it's a half-job, sadly, though, still worth going through the motions to use it, as, often, it does work well. I think (maybe?) a first step for the dev. should be to make usage of the add-on a LOT clearer and easier. I mean, this is overly obvious. From there, some good tweaking / researching users would / could make this a fine add-on.
My humble 5c worth...