Rated 5 out of 5 stars
This is a top add on, and which I think should be the default scrollbar. I missed the superb Noia 4 theme which ceased to be updated due to FF updates breaking it too often, and found the FT DeepDark theme to be the best replacement, except the vertical scrollbar was too dark and hard to see.
But thank God i came across this scroll bar replacement! It is not only improves visibility but it is a work of beauty! I also appreciate those who make such customizations.