Solved Firefox 43 didn't work

Hi, all.
My system is FreeBSD 10.2 x64 with Gnome 3.14.
I used pkg install firefox to get Firefox 43.0.4.
Although the cursor showed that Firefox was loading, my Firefox did not work in fact.
How to find out the problem?
I checked ~/.mozilla and got nothing special.
Thanks for help.
Thanks tobik.
My system showed
/usr/local/lib/firefox/ Undefined symbol "hb_buffer_set_cluster_level"
Although I re-installed www/libxul, the error was the same.
What's the solution?
Thanks again.