Ah, ok. But the browser using the engine has small source code, or? But actually you are right, a program using a big and complicated engine isn’t small.
I think my favourite project to try to hack is Netsurf. Unfortunately the Netsurf crew wasn’t very helpful (Falkon crew wasn’t, too). But I don’t need the original admins to improve the software.
Edit: I found out that there is Arora. But it uses WebKit 1 I think. So it’s both a bit outdated and kind of big I think. I like Netsurf’s code design the best anyways.
Edit2: I found Otter. Same issue as Falkon.
(The thread suggestion on these forums is weird. When I view the same thread two times there are different threads recommended for me!)