Out of all YouTube related add-ons, I think this is the most useful one.
Still, if it were possible, I'd give Enhancer for YT 4.8 stars instead of 5, just because of the problem within add-on: *reverse playlist does not work* .
Also, on the "Settings" page, a "save (settings)" button would be appreciated, simply as a peace-of-mind button, i.e. insuring that changes were really saved... but only if it wouldn't be much hassle to make it happen. It's not that big a deal.
I could come up with plenty ideas for features that might fit nicely with EfYT, (say a button sorting comments from the oldest to the newest one... and more), but according to review guidelines I'm not supposed to ask for any, so I won't. In any case, thanks for this lovely add-on.