Most regular websurfers use addons for their preferred internet browser to provide useful extra functions, but did you know some addons are not what they apear to be? This is one such example of a rogue addon you definitely do not want to install. The real address of the link shows up in the bottom left when you hover over the "install now" button, and it is nothing to do with Mozilla.com (where all official Firefox downloads including addons should come from), and instead a subdomain of reupd(dot)net. As it doesn't come from an official Mozilla address, it's most certainly rogueware.