In the latest Firefox browser, I find the right hand, vertical scroll bars so subtle, that it takes focused looking to find it and the images to click on to move the page vertically. I suspect that the programmers wanted it to be in the background, but it is too much blended into the white page with it's faint light gray. That should be changed to make it easier to use like the clear blue bar and up and down black arrows present in this Blog on my Firefox browser.
Or, is their a setting I have not found yet which can change it to a more contrasting hue?