This was mentioned in bug 630293, comment 9, as an url where people were crashing with Fennec. I was hanging on that site with trunk Fennec, using the LG Optimus Black and I was hanging so long, that the whole OS rebooted. I guess it has something to do with all the large images that site is using. Iirc, correctly, there are already some bugs filed for this, perhaps.
Joe Drew might know more about large images causing Fennec to hang type of bugs.
This might be related to bug 660577
We have lots of bugs on this sort of thing; look through bug 683284. I'm not sure that this particular bug adds anything.
Feel free to dupe this against any bug you find appropriate.