Breaking working code and slowing down fast code are consequences of making progress toward
other goals that the developers believe are more important. This is especially true for
"beta" or "release candidate" software. The bugs have been reported and they'll be fixed when
the necessary resources are available so it's not clear what you think you're going to
accomplish by ranting.
If your underlying platform is KDE/Qt then you should use a browser that integrates with these
technologies or learn to live with the consequences of using one that doesn't. I think it
would be great if Firefox offered a KDE/Qt integrated version in addition to the GTK+ port,
but as far as I know they don't yet. You could try Konquerer. In any case whining is not
going to help you.