The firefox (29.0,1) browser can be easily made to crash by simply building
it with the DEBUG option, installing it, and then using it to browse to
various web sites, e.g. in particular www.newegg.com.
I have no idea.
Over to maintainer (via the GNATS Auto Assign Tool)
Fixed in r357413 by files/patch-bug975397. Please, update to firefox 30.0.