I noticed today that Firefox adds a bunch of scripts to every pageload. Here's a screenshot: I checked the add-ons. It's just Adblocker plus, Firebug, colorzilla, lastpass, screengrab, share-a-holic. So, nothing suspicious there. I have Microsoft Security Essentials and scans are clean. What might be causing the issue?
If you go take a look at the script address itself, at
A quick search indicates that this may be a form of adware - removal instructions are available at the linked site.