Could #643613 be the same bug as this one? It also happens with Iceweasel/Firefox since the same time, although I don't use intel_drv. Also, there is a gdb backtrace of the crash, which I'm copying here:
Program received signal SIGSEGV, Segmentation fault.
0x407a045b in dri2_invalidate_drawable (dPriv=0x93c3318) at dri2.c:61
61 dri2.c: No such file or directory.