Comment 2 for bug 556125

One more comment. The bug here is about the same issue: https://bugs.launchpad.net/ubuntu/+source/firefox-3.0/+bug/503623
It is suggested that there is a problem with extensions like adblock or noscript, could you try again with a fresh profile? https://wiki.ubuntu.com/MozillaTeam/Bugs?action=show&redirect=DebuggingFirefox#Try%20with%20a%20new%20profile