Description of problem:

Kaboom.

Version-Release number of selected component (if applicable):

2.7.3-1

How reproducible:

Dunno, it just happened now

Steps to Reproduce:
1. Had three windows, five tabs.
2. Was typing on one
3. It hung for a short period, then...
  
Actual results:

*bang*

Expected results:

No bang.

Additional info:

Backtrace is:
0x006f1782 in ?? ()
(gdb) bt
#0  0x006f1782 in ?? ()
#1  0x009543fb in xmlXPathIsNodeType () from /usr/lib/libxml2.so.2
#2  0x05b49a94 in ?? ()
#3  0x00000000 in ?? ()
(gdb) 

And this is *with* debuginfo. I think gdb is misbehaving. :/