Not sure if this is the defined behavior of our stack.
But in Go Thrust Janky Browser, one of the ThrustShell processes continues to grow in memory with each webpage visited.

Lets say we start at 30m
visit google => 32m
visit hello world searches first link => 37m
click <- to go back 39m
visit the same link again => 45m
go back 47m

visiting the same pages over and over continues to grow the memory, i didnt keep doing it so i dont know if their is a ceiling. But this could be bad, care to chime in @spolu