Originally Posted by fragos
I use Noia Extreme and the only vertical scroll bar is on the right. Things can be visually confusing when the cursor is in a frame. In that case I believe the scroll bar only refers to the page and won't move if you're scrolling within a frame.
I apologize if I wasn't clear. Its difficult to comment on technical issues if you don't know your audience. I made assumptions about your understanding of terminology that weren't true. If you still have a problem understanding what I've said, please be more specific about what you don't understand and I'll delve deeper for you.
Noia Extreme is a Firefox theme limited to that application. This theme changes icons used and adds them to drop down menus as well.
Now the second part and bear with me if I cover some items you do understand. Frames on a web page are a parallel to windows on your desktop. Sometimes these frames have their own scroll bars. Many users use these visual scroll bars only as a visual aid and do all scrolling with their mouse scroll wheel. If the cursor is in the outer or primary frame the scroll wheel scrolls the entire viewed image. However if you place the cursor within a frame, only that frame scrolls or if the frame is totally viewable within your current window, nothing happens.