Why browsers are bloated

https://github.com/WebKit/webkit/blob/master/Source/WebCore/platform/Scrollbar.cpp
https://github.com/WebKit/webkit/blob/master/Source/WebCore/platform/win/ScrollbarThemeWin.cpp
Let's reinvent the fucking scrollbar, which every goddamn platform with a UI already has, and make it behave subtly different from the native one!

Right-click a native scrollbar in some other app:
- Scroll Here
- Top
- Bottom
- Page Up
- Page Down
- Scroll Up
- Scroll Down

Right-click a scrollbar in Chrome:
- Back
- Forward
- Reload
- Save As...
...

Right-click a scrollbar in Firefox and Opera:
Absolutely fucking nothing happens!

What the fuck!? How did these terminally retarded idiots get involved in creating one of the most important pieces of software to the average user?

>>44
Tons of browsers using Gecko besides Firefox:
http://en.wikipedia.org/wiki/Gecko_(software)#Usage

In the past, Gecko had slower market share adoption due to the complexity of the Gecko code, which aimed to provide much more than just an HTML renderer for web browsers.[19][20][21] Mozilla's engineering efforts since then have addressed many of these historical weaknesses.[22]

The Gecko engine also provides a versatile XML-based user interface rendering framework called XUL that was used extensively in mail, newsgroup, and other programs. Another reason for much of the complexity in Gecko is the use of XPCOM, a cross-platform component model.[23] However, its use has been scaled back.[24]

If Webkit is supposed to be the simpler alternative, I don't even want to know waht Gecko code looks like...