Short bio: Computer Scientist, FOSS supporter (read more)
Tux Machines (TM)-specific
Most web browsers now are complicated programs with thousands of lines of code and generally have lots of various options so you can customise them to the nth degree.
However, I recently stumbled across Fastpatx web browser, which is written in PyQT and contains around 50 lines of code. It is very simple and has a very plain and uncrowded interface.