UK-based Glubble, a free parental-control add-on for Firefox, has secured a $3 million funding round from existing angel investors to continue the development of its product, which also allows a family circle to link up via Firefox to decide what they can see online. Morten Lund, one of the first investors in Skype, is one of those existing angels. Founded in 2006 by Ian Hayward, Glubble had early support from Firefox users keen to have some kind of parental control on the open-source browser. The full software suite has been downloaded about 100,000 times. A premium service which will be available later in the year.