Ubuntu Firefox 3 High CPU

I was experiencing regular CPU spikes of 25% not sure if this is related to LiveBookMark updating or the anti-phishing feature.
I had turned off the anti-phishing stuff previously but it could, apparently, still be related to it trying to update its blacklist.

[Update]
Related to:
https://bugzilla.mozilla.org/show_bug.cgi?id=329534
Bug 329534 – Live bookmarks load way too agressive (lock up/hang/freeze browser)