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On Firefox 29.0 when I visit http://data.stackexchange.com/stackoverflow/query/209394, the browser comes to a grinding halt and does not recover.
On Chrome 35.0.1916.153 when I visit the same page the tab also grinds to a halt permanently until closed.
In both case the page loads, then the syntax highlighting loads, then at some point after that it freezes, pegging the CPU at 100%.
This problem is 100% reproducible, for me at least. I was working on the query and it was fine with an occasional unresponsive script. Then I created a permalink and the problem has been happening since.
Ubuntu 12.04 LTS 64-bit
I have no plugins or add-ons for either browser.