"Mozilla.org says it fixed a problem with Firefox 3 Beta 1 that
caused it to spike CPU usage and eat hundreds of megabytes of RAM.
The fix involved changing the configuration of a server that
Firefox communicates with, so you don't have to download a new
version to take advantage of it.
"The bug affects Firefox installations with very outdated lists
of bad sites for the phishing protection and malware protection
features of the browser, according to a report on Mozillazine. It
also affects installations that have no list of bad sites at
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