[kubuntu] Freezing firefox

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http://ubuntuforums.org – Installed kubuntu 12.04 from alternate cd (fully encrypted). Running firefox with js off. Also disabled all visible add-ons. No plugins, no flash. System should be secure and fast. Instead what happens: firefox freezes not only iself but the whole desktop for no reason quite often. When a big page is loaded it may freeze (even this should not happen), but it happens at random times. Sometimes I get an error (after freezing) which says something.js is not resposnding. Why is it even running: js is supposed to be off. Don't want to add any addons or plugins for extrasecurity. I just don't want (Hardware)