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. Fix: I have no idea. How-To-Repeat: See above.
Responsible Changed From-To: freebsd-ports-bugs->gecko Over to maintainer (via the GNATS Auto Assign Tool)
Fixed in r357413 by files/patch-bug975397. Please, update to firefox 30.0.