luakit

luakit is a powerful customizable web browser for Linux. In their own words:

Luakit is a highly configurable, micro-browser framework based on the WebKit web content engine and the GTK+ toolkit. It is very fast, extensible by Lua and licensed under the GNU GPLv3 license.

It is primarily targeted at power users, developers and any people with too much time on their hands who want to have fine-grained control over their web browsers behaviour and interface.

'perlguy' has written up his customizations to get TiddlyWiki working: https://github.com/perlguy/luakit-tiddlywiki