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I'm afraid you can't do this in Firefox, or in-fact in any browser except Opera but it's glitchy on Opera.
Sorry about that, Ron.
But, I could if it helps suggest it for further updates....?
Yes, an update on this would be nice. What's Mozilla thinking? Not everybody has 20-year-old eyes.
Hello Ron, see if the next add-on is helpful : NewScrollbars (aka NoiaScrollbars)
you can wait another contributor to give you a code for the current scrollbar(to make it larger)
Thank you. Noia Scrollbars are pretty, but the same small size. Having the code to make 'em bigger would be good.