(This happens on my laptop, Snow Leopard.)
Actually, I misremembered. It didn't crash, it just stopped responding and I had to kill it (I sent one report to Apple, no Firefox crash reporter).
Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.3a1pre) Gecko/20091110 Minefield/3.7a1pre
It hangs indeed with all Firefox versions I tried. Also with IE8, Google Chrome and Opera. Maybe sending with the wrong content type?
Well, yeah, it's trying to send the source of a 9.2M file PDF inline, which probably isn't as intended. Still, Firefox hanging seems bad.
Also, hung and then crashed my trunk nightly.
Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.3a1pre) Gecko/20091110 Minefield/3.7a1pre
In Windows Task Manager it took like 500MB while hanging.
behaves poorly in terms of cpu and memory and stops after about 40-50seconds on fast 4GB machine, but not before firefox gobbled 800MB. Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0b9pre) Gecko/20101227 Firefox/4.0b9pre
very likely a duplicate of a layout performance bug
Works fine on Aurora (8.0a2).