From MozillaZine Knowledge Base
As part of its Safe Browsing feature, Mozilla Firefox keeps track of a list of malware to compare against data the end user downloads. In the event the user downloads known malware, a warning can be displayed. This preference determines the URL for the â€œWhy was this site blocked?â€ button displayed with these warnings.
Possible values and their effects
The URL the user will visit upon clicking the â€œWhy was this site blocked?â€ button on malware warning pages. Default value is http://safebrowsing.clients.google.com/safebrowsing/diagnostic?client=%NAME%&hl=%LOCALE%&site=.
First checked in
Has an effect in