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?

More insanity, this time from the Mozilla side:
https://bugzilla.mozilla.org/show_bug.cgi?id=630181

Put the complex quadratic-time text-wrapping algorithm of TeX into a browser? What the fuck!? I'm going to bet that 99.999% of browser users out there don't give a flying monkeyfuck about justified text. Just count up the number of spaces in each line, divide the width remaining by it, and add that to each one. Done. Fast and simple and good enough.