AdBlock Plus

If you happen to use this Firefox addon you need to update your filters, at least one has had a failure to update for some - Malware Domains
Click your little red stop sign at the top of your page to open AdBlock Plus
go to Adblock Plus Preferences -
click on Filters -
There you will see a place to update all subscriptions.
Click it so the updating will get done, this is usually automatic but for some reason there was a failure to load the updates for Malware Domains.