Running on small (640x480) screen so attempted to
get rid of toolbar. Couldn't remember how. Tried clicking
and double-clicking on the left-hand bit of the toolbar
(which you'd actually use to drag the toolbar somewhere).
Nothing happened. Clicked a lot more, very fast, here.
Moved mouse infinitesmally whilst doing this. Bang!
Created attachment 1211 [details]
crappy backtrace of gnome-help-browser crash (stripped, so few symbols)
Does this still happen for you? I can't reproduce it here (on a 1024x768
I can't reproduce this either, fwiw.