Created attachment 652460 [details]
Was clicking a link on www.amazon.com. Sometimes made it through one click, sometimes crashed on the first click.
I believe this is the same crash: http://crash-stats.mozilla.com/report/index/bp-c81c008c-6a9b-400b-ae97-845bd2120816
Stack trace attached.
Nightly is 17.0a1 (2012-08-15) built from http://hg.mozilla.org/mozilla-central/rev/86ee4deea55b
Your nightly is a known crasher. There was a re-spin yesterday, and now today's build is out... update and see if the crash persists.
Yup, all better now. Thanks.